From 253bd5016709f5a070ac792597ccf9f11cd29852 Mon Sep 17 00:00:00 2001
From: Craig Tiller <ctiller@google.com>
Date: Thu, 25 Feb 2016 12:30:23 -0800
Subject: [PATCH] Allow selecting poll strategy, start to stub ev_poll_posix.c

---
 src/core/iomgr/ev_poll_posix.c      |  1645 ++
 src/core/iomgr/ev_poll_posix.h      |    41 +
 src/core/iomgr/ev_posix.c           |    83 +-
 test/core/end2end/gen_build_yaml.py |    24 +-
 tools/run_tests/run_tests.py        |    12 +-
 tools/run_tests/tests.json          | 36589 +++++++++++++++++++++++---
 6 files changed, 34282 insertions(+), 4112 deletions(-)
 create mode 100644 src/core/iomgr/ev_poll_posix.c
 create mode 100644 src/core/iomgr/ev_poll_posix.h

diff --git a/src/core/iomgr/ev_poll_posix.c b/src/core/iomgr/ev_poll_posix.c
new file mode 100644
index 0000000000..3693e13729
--- /dev/null
+++ b/src/core/iomgr/ev_poll_posix.c
@@ -0,0 +1,1645 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/* This file will be removed shortly: it's here to keep refactoring
+ * steps simple and auditable.
+ * It's the combination of the old files:
+ *  - fd_posix.{h,c}
+ *  - pollset_posix.{h,c}
+ *  - pullset_multipoller_with_{poll,epoll}.{h,c}
+ * The new version will be split into:
+ *  - ev_poll_posix.{h,c}
+ *  - ev_epoll_posix.{h,c}
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_POSIX_SOCKET
+
+#include "src/core/iomgr/ev_poll_and_epoll_posix.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <poll.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/tls.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/iomgr/iomgr_internal.h"
+#include "src/core/iomgr/wakeup_fd_posix.h"
+#include "src/core/profiling/timers.h"
+#include "src/core/support/block_annotate.h"
+
+/*******************************************************************************
+ * FD declarations
+ */
+
+typedef struct grpc_fd_watcher {
+  struct grpc_fd_watcher *next;
+  struct grpc_fd_watcher *prev;
+  grpc_pollset *pollset;
+  grpc_pollset_worker *worker;
+  grpc_fd *fd;
+} grpc_fd_watcher;
+
+struct grpc_fd {
+  int fd;
+  /* refst format:
+     bit0:   1=active/0=orphaned
+     bit1-n: refcount
+     meaning that mostly we ref by two to avoid altering the orphaned bit,
+     and just unref by 1 when we're ready to flag the object as orphaned */
+  gpr_atm refst;
+
+  gpr_mu mu;
+  int shutdown;
+  int closed;
+  int released;
+
+  /* The watcher list.
+
+     The following watcher related fields are protected by watcher_mu.
+
+     An fd_watcher is an ephemeral object created when an fd wants to
+     begin polling, and destroyed after the poll.
+
+     It denotes the fd's interest in whether to read poll or write poll
+     or both or neither on this fd.
+
+     If a watcher is asked to poll for reads or writes, the read_watcher
+     or write_watcher fields are set respectively. A watcher may be asked
+     to poll for both, in which case both fields will be set.
+
+     read_watcher and write_watcher may be NULL if no watcher has been
+     asked to poll for reads or writes.
+
+     If an fd_watcher is not asked to poll for reads or writes, it's added
+     to a linked list of inactive watchers, rooted at inactive_watcher_root.
+     If at a later time there becomes need of a poller to poll, one of
+     the inactive pollers may be kicked out of their poll loops to take
+     that responsibility. */
+  grpc_fd_watcher inactive_watcher_root;
+  grpc_fd_watcher *read_watcher;
+  grpc_fd_watcher *write_watcher;
+
+  grpc_closure *read_closure;
+  grpc_closure *write_closure;
+
+  struct grpc_fd *freelist_next;
+
+  grpc_closure *on_done_closure;
+
+  grpc_iomgr_object iomgr_object;
+};
+
+/* Begin polling on an fd.
+   Registers that the given pollset is interested in this fd - so that if read
+   or writability interest changes, the pollset can be kicked to pick up that
+   new interest.
+   Return value is:
+     (fd_needs_read? read_mask : 0) | (fd_needs_write? write_mask : 0)
+   i.e. a combination of read_mask and write_mask determined by the fd's current
+   interest in said events.
+   Polling strategies that do not need to alter their behavior depending on the
+   fd's current interest (such as epoll) do not need to call this function.
+   MUST NOT be called with a pollset lock taken */
+static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset,
+                              grpc_pollset_worker *worker, uint32_t read_mask,
+                              uint32_t write_mask, grpc_fd_watcher *rec);
+/* Complete polling previously started with fd_begin_poll
+   MUST NOT be called with a pollset lock taken
+   if got_read or got_write are 1, also does the become_{readable,writable} as
+   appropriate. */
+static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *rec,
+                        int got_read, int got_write);
+
+/* Return 1 if this fd is orphaned, 0 otherwise */
+static bool fd_is_orphaned(grpc_fd *fd);
+
+/* Notification from the poller to an fd that it has become readable or
+   writable.
+   If allow_synchronous_callback is 1, allow running the fd callback inline
+   in this callstack, otherwise register an asynchronous callback and return */
+static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd);
+static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd);
+
+/* Reference counting for fds */
+/*#define GRPC_FD_REF_COUNT_DEBUG*/
+#ifdef GRPC_FD_REF_COUNT_DEBUG
+static void fd_ref(grpc_fd *fd, const char *reason, const char *file, int line);
+static void fd_unref(grpc_fd *fd, const char *reason, const char *file,
+                     int line);
+#define GRPC_FD_REF(fd, reason) fd_ref(fd, reason, __FILE__, __LINE__)
+#define GRPC_FD_UNREF(fd, reason) fd_unref(fd, reason, __FILE__, __LINE__)
+#else
+static void fd_ref(grpc_fd *fd);
+static void fd_unref(grpc_fd *fd);
+#define GRPC_FD_REF(fd, reason) fd_ref(fd)
+#define GRPC_FD_UNREF(fd, reason) fd_unref(fd)
+#endif
+
+static void fd_global_init(void);
+static void fd_global_shutdown(void);
+
+#define CLOSURE_NOT_READY ((grpc_closure *)0)
+#define CLOSURE_READY ((grpc_closure *)1)
+
+/*******************************************************************************
+ * pollset declarations
+ */
+
+typedef struct grpc_pollset_vtable grpc_pollset_vtable;
+
+typedef struct grpc_cached_wakeup_fd {
+  grpc_wakeup_fd fd;
+  struct grpc_cached_wakeup_fd *next;
+} grpc_cached_wakeup_fd;
+
+struct grpc_pollset_worker {
+  grpc_cached_wakeup_fd *wakeup_fd;
+  int reevaluate_polling_on_wakeup;
+  int kicked_specifically;
+  struct grpc_pollset_worker *next;
+  struct grpc_pollset_worker *prev;
+};
+
+struct grpc_pollset {
+  /* pollsets under posix can mutate representation as fds are added and
+     removed.
+     For example, we may choose a poll() based implementation on linux for
+     few fds, and an epoll() based implementation for many fds */
+  const grpc_pollset_vtable *vtable;
+  gpr_mu *mu;
+  grpc_pollset_worker root_worker;
+  int in_flight_cbs;
+  int shutting_down;
+  int called_shutdown;
+  int kicked_without_pollers;
+  grpc_closure *shutdown_done;
+  grpc_closure_list idle_jobs;
+  union {
+    int fd;
+    void *ptr;
+  } data;
+  /* Local cache of eventfds for workers */
+  grpc_cached_wakeup_fd *local_wakeup_cache;
+};
+
+struct grpc_pollset_vtable {
+  void (*add_fd)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                 struct grpc_fd *fd, int and_unlock_pollset);
+  void (*maybe_work_and_unlock)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                                grpc_pollset_worker *worker,
+                                gpr_timespec deadline, gpr_timespec now);
+  void (*finish_shutdown)(grpc_pollset *pollset);
+  void (*destroy)(grpc_pollset *pollset);
+};
+
+/* Add an fd to a pollset */
+static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                           struct grpc_fd *fd);
+
+static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx,
+                               grpc_pollset_set *pollset_set, grpc_fd *fd);
+
+/* Convert a timespec to milliseconds:
+   - very small or negative poll times are clamped to zero to do a
+     non-blocking poll (which becomes spin polling)
+   - other small values are rounded up to one millisecond
+   - longer than a millisecond polls are rounded up to the next nearest
+     millisecond to avoid spinning
+   - infinite timeouts are converted to -1 */
+static int poll_deadline_to_millis_timeout(gpr_timespec deadline,
+                                           gpr_timespec now);
+
+/* Allow kick to wakeup the currently polling worker */
+#define GRPC_POLLSET_CAN_KICK_SELF 1
+/* Force the wakee to repoll when awoken */
+#define GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP 2
+/* As per pollset_kick, with an extended set of flags (defined above)
+   -- mostly for fd_posix's use. */
+static void pollset_kick_ext(grpc_pollset *p,
+                             grpc_pollset_worker *specific_worker,
+                             uint32_t flags);
+
+/* turn a pollset into a multipoller: platform specific */
+typedef void (*platform_become_multipoller_type)(grpc_exec_ctx *exec_ctx,
+                                                 grpc_pollset *pollset,
+                                                 struct grpc_fd **fds,
+                                                 size_t fd_count);
+static platform_become_multipoller_type platform_become_multipoller;
+
+/* Return 1 if the pollset has active threads in pollset_work (pollset must
+ * be locked) */
+static int pollset_has_workers(grpc_pollset *pollset);
+
+static void remove_fd_from_all_epoll_sets(int fd);
+
+/* override to allow tests to hook poll() usage */
+typedef int (*grpc_poll_function_type)(struct pollfd *, nfds_t, int);
+extern grpc_poll_function_type grpc_poll_function;
+extern grpc_wakeup_fd grpc_global_wakeup_fd;
+
+/*******************************************************************************
+ * pollset_set definitions
+ */
+
+struct grpc_pollset_set {
+  gpr_mu mu;
+
+  size_t pollset_count;
+  size_t pollset_capacity;
+  grpc_pollset **pollsets;
+
+  size_t pollset_set_count;
+  size_t pollset_set_capacity;
+  struct grpc_pollset_set **pollset_sets;
+
+  size_t fd_count;
+  size_t fd_capacity;
+  grpc_fd **fds;
+};
+
+/*******************************************************************************
+ * fd_posix.c
+ */
+
+/* We need to keep a freelist not because of any concerns of malloc performance
+ * but instead so that implementations with multiple threads in (for example)
+ * epoll_wait deal with the race between pollset removal and incoming poll
+ * notifications.
+ *
+ * The problem is that the poller ultimately holds a reference to this
+ * object, so it is very difficult to know when is safe to free it, at least
+ * without some expensive synchronization.
+ *
+ * If we keep the object freelisted, in the worst case losing this race just
+ * becomes a spurious read notification on a reused fd.
+ */
+/* TODO(klempner): We could use some form of polling generation count to know
+ * when these are safe to free. */
+/* TODO(klempner): Consider disabling freelisting if we don't have multiple
+ * threads in poll on the same fd */
+/* TODO(klempner): Batch these allocations to reduce fragmentation */
+static grpc_fd *fd_freelist = NULL;
+static gpr_mu fd_freelist_mu;
+
+static void freelist_fd(grpc_fd *fd) {
+  gpr_mu_lock(&fd_freelist_mu);
+  fd->freelist_next = fd_freelist;
+  fd_freelist = fd;
+  grpc_iomgr_unregister_object(&fd->iomgr_object);
+  gpr_mu_unlock(&fd_freelist_mu);
+}
+
+static grpc_fd *alloc_fd(int fd) {
+  grpc_fd *r = NULL;
+  gpr_mu_lock(&fd_freelist_mu);
+  if (fd_freelist != NULL) {
+    r = fd_freelist;
+    fd_freelist = fd_freelist->freelist_next;
+  }
+  gpr_mu_unlock(&fd_freelist_mu);
+  if (r == NULL) {
+    r = gpr_malloc(sizeof(grpc_fd));
+    gpr_mu_init(&r->mu);
+  }
+
+  gpr_atm_rel_store(&r->refst, 1);
+  r->shutdown = 0;
+  r->read_closure = CLOSURE_NOT_READY;
+  r->write_closure = CLOSURE_NOT_READY;
+  r->fd = fd;
+  r->inactive_watcher_root.next = r->inactive_watcher_root.prev =
+      &r->inactive_watcher_root;
+  r->freelist_next = NULL;
+  r->read_watcher = r->write_watcher = NULL;
+  r->on_done_closure = NULL;
+  r->closed = 0;
+  r->released = 0;
+  return r;
+}
+
+static void destroy(grpc_fd *fd) {
+  gpr_mu_destroy(&fd->mu);
+  gpr_free(fd);
+}
+
+#ifdef GRPC_FD_REF_COUNT_DEBUG
+#define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__)
+#define UNREF_BY(fd, n, reason) unref_by(fd, n, reason, __FILE__, __LINE__)
+static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file,
+                   int line) {
+  gpr_log(GPR_DEBUG, "FD %d %p   ref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n,
+          gpr_atm_no_barrier_load(&fd->refst),
+          gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line);
+#else
+#define REF_BY(fd, n, reason) ref_by(fd, n)
+#define UNREF_BY(fd, n, reason) unref_by(fd, n)
+static void ref_by(grpc_fd *fd, int n) {
+#endif
+  GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0);
+}
+
+#ifdef GRPC_FD_REF_COUNT_DEBUG
+static void unref_by(grpc_fd *fd, int n, const char *reason, const char *file,
+                     int line) {
+  gpr_atm old;
+  gpr_log(GPR_DEBUG, "FD %d %p unref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n,
+          gpr_atm_no_barrier_load(&fd->refst),
+          gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line);
+#else
+static void unref_by(grpc_fd *fd, int n) {
+  gpr_atm old;
+#endif
+  old = gpr_atm_full_fetch_add(&fd->refst, -n);
+  if (old == n) {
+    freelist_fd(fd);
+  } else {
+    GPR_ASSERT(old > n);
+  }
+}
+
+static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); }
+
+static void fd_global_shutdown(void) {
+  gpr_mu_lock(&fd_freelist_mu);
+  gpr_mu_unlock(&fd_freelist_mu);
+  while (fd_freelist != NULL) {
+    grpc_fd *fd = fd_freelist;
+    fd_freelist = fd_freelist->freelist_next;
+    destroy(fd);
+  }
+  gpr_mu_destroy(&fd_freelist_mu);
+}
+
+static grpc_fd *fd_create(int fd, const char *name) {
+  grpc_fd *r = alloc_fd(fd);
+  char *name2;
+  gpr_asprintf(&name2, "%s fd=%d", name, fd);
+  grpc_iomgr_register_object(&r->iomgr_object, name2);
+  gpr_free(name2);
+#ifdef GRPC_FD_REF_COUNT_DEBUG
+  gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, r, name);
+#endif
+  return r;
+}
+
+static bool fd_is_orphaned(grpc_fd *fd) {
+  return (gpr_atm_acq_load(&fd->refst) & 1) == 0;
+}
+
+static void pollset_kick_locked(grpc_fd_watcher *watcher) {
+  gpr_mu_lock(watcher->pollset->mu);
+  GPR_ASSERT(watcher->worker);
+  pollset_kick_ext(watcher->pollset, watcher->worker,
+                   GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP);
+  gpr_mu_unlock(watcher->pollset->mu);
+}
+
+static void maybe_wake_one_watcher_locked(grpc_fd *fd) {
+  if (fd->inactive_watcher_root.next != &fd->inactive_watcher_root) {
+    pollset_kick_locked(fd->inactive_watcher_root.next);
+  } else if (fd->read_watcher) {
+    pollset_kick_locked(fd->read_watcher);
+  } else if (fd->write_watcher) {
+    pollset_kick_locked(fd->write_watcher);
+  }
+}
+
+static void wake_all_watchers_locked(grpc_fd *fd) {
+  grpc_fd_watcher *watcher;
+  for (watcher = fd->inactive_watcher_root.next;
+       watcher != &fd->inactive_watcher_root; watcher = watcher->next) {
+    pollset_kick_locked(watcher);
+  }
+  if (fd->read_watcher) {
+    pollset_kick_locked(fd->read_watcher);
+  }
+  if (fd->write_watcher && fd->write_watcher != fd->read_watcher) {
+    pollset_kick_locked(fd->write_watcher);
+  }
+}
+
+static int has_watchers(grpc_fd *fd) {
+  return fd->read_watcher != NULL || fd->write_watcher != NULL ||
+         fd->inactive_watcher_root.next != &fd->inactive_watcher_root;
+}
+
+static void close_fd_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd) {
+  fd->closed = 1;
+  if (!fd->released) {
+    close(fd->fd);
+  } else {
+    remove_fd_from_all_epoll_sets(fd->fd);
+  }
+  grpc_exec_ctx_enqueue(exec_ctx, fd->on_done_closure, true, NULL);
+}
+
+static int fd_wrapped_fd(grpc_fd *fd) {
+  if (fd->released || fd->closed) {
+    return -1;
+  } else {
+    return fd->fd;
+  }
+}
+
+static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd,
+                      grpc_closure *on_done, int *release_fd,
+                      const char *reason) {
+  fd->on_done_closure = on_done;
+  fd->released = release_fd != NULL;
+  if (!fd->released) {
+    shutdown(fd->fd, SHUT_RDWR);
+  } else {
+    *release_fd = fd->fd;
+  }
+  gpr_mu_lock(&fd->mu);
+  REF_BY(fd, 1, reason); /* remove active status, but keep referenced */
+  if (!has_watchers(fd)) {
+    close_fd_locked(exec_ctx, fd);
+  } else {
+    wake_all_watchers_locked(fd);
+  }
+  gpr_mu_unlock(&fd->mu);
+  UNREF_BY(fd, 2, reason); /* drop the reference */
+}
+
+/* increment refcount by two to avoid changing the orphan bit */
+#ifdef GRPC_FD_REF_COUNT_DEBUG
+static void fd_ref(grpc_fd *fd, const char *reason, const char *file,
+                   int line) {
+  ref_by(fd, 2, reason, file, line);
+}
+
+static void fd_unref(grpc_fd *fd, const char *reason, const char *file,
+                     int line) {
+  unref_by(fd, 2, reason, file, line);
+}
+#else
+static void fd_ref(grpc_fd *fd) { ref_by(fd, 2); }
+
+static void fd_unref(grpc_fd *fd) { unref_by(fd, 2); }
+#endif
+
+static void notify_on_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd,
+                             grpc_closure **st, grpc_closure *closure) {
+  if (*st == CLOSURE_NOT_READY) {
+    /* not ready ==> switch to a waiting state by setting the closure */
+    *st = closure;
+  } else if (*st == CLOSURE_READY) {
+    /* already ready ==> queue the closure to run immediately */
+    *st = CLOSURE_NOT_READY;
+    grpc_exec_ctx_enqueue(exec_ctx, closure, !fd->shutdown, NULL);
+    maybe_wake_one_watcher_locked(fd);
+  } else {
+    /* upcallptr was set to a different closure.  This is an error! */
+    gpr_log(GPR_ERROR,
+            "User called a notify_on function with a previous callback still "
+            "pending");
+    abort();
+  }
+}
+
+/* returns 1 if state becomes not ready */
+static int set_ready_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd,
+                            grpc_closure **st) {
+  if (*st == CLOSURE_READY) {
+    /* duplicate ready ==> ignore */
+    return 0;
+  } else if (*st == CLOSURE_NOT_READY) {
+    /* not ready, and not waiting ==> flag ready */
+    *st = CLOSURE_READY;
+    return 0;
+  } else {
+    /* waiting ==> queue closure */
+    grpc_exec_ctx_enqueue(exec_ctx, *st, !fd->shutdown, NULL);
+    *st = CLOSURE_NOT_READY;
+    return 1;
+  }
+}
+
+static void set_ready(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_closure **st) {
+  /* only one set_ready can be active at once (but there may be a racing
+     notify_on) */
+  gpr_mu_lock(&fd->mu);
+  set_ready_locked(exec_ctx, fd, st);
+  gpr_mu_unlock(&fd->mu);
+}
+
+static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd) {
+  gpr_mu_lock(&fd->mu);
+  GPR_ASSERT(!fd->shutdown);
+  fd->shutdown = 1;
+  set_ready_locked(exec_ctx, fd, &fd->read_closure);
+  set_ready_locked(exec_ctx, fd, &fd->write_closure);
+  gpr_mu_unlock(&fd->mu);
+}
+
+static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd,
+                              grpc_closure *closure) {
+  gpr_mu_lock(&fd->mu);
+  notify_on_locked(exec_ctx, fd, &fd->read_closure, closure);
+  gpr_mu_unlock(&fd->mu);
+}
+
+static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd,
+                               grpc_closure *closure) {
+  gpr_mu_lock(&fd->mu);
+  notify_on_locked(exec_ctx, fd, &fd->write_closure, closure);
+  gpr_mu_unlock(&fd->mu);
+}
+
+static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset,
+                              grpc_pollset_worker *worker, uint32_t read_mask,
+                              uint32_t write_mask, grpc_fd_watcher *watcher) {
+  uint32_t mask = 0;
+  grpc_closure *cur;
+  int requested;
+  /* keep track of pollers that have requested our events, in case they change
+   */
+  GRPC_FD_REF(fd, "poll");
+
+  gpr_mu_lock(&fd->mu);
+
+  /* if we are shutdown, then don't add to the watcher set */
+  if (fd->shutdown) {
+    watcher->fd = NULL;
+    watcher->pollset = NULL;
+    watcher->worker = NULL;
+    gpr_mu_unlock(&fd->mu);
+    GRPC_FD_UNREF(fd, "poll");
+    return 0;
+  }
+
+  /* if there is nobody polling for read, but we need to, then start doing so */
+  cur = fd->read_closure;
+  requested = cur != CLOSURE_READY;
+  if (read_mask && fd->read_watcher == NULL && requested) {
+    fd->read_watcher = watcher;
+    mask |= read_mask;
+  }
+  /* if there is nobody polling for write, but we need to, then start doing so
+   */
+  cur = fd->write_closure;
+  requested = cur != CLOSURE_READY;
+  if (write_mask && fd->write_watcher == NULL && requested) {
+    fd->write_watcher = watcher;
+    mask |= write_mask;
+  }
+  /* if not polling, remember this watcher in case we need someone to later */
+  if (mask == 0 && worker != NULL) {
+    watcher->next = &fd->inactive_watcher_root;
+    watcher->prev = watcher->next->prev;
+    watcher->next->prev = watcher->prev->next = watcher;
+  }
+  watcher->pollset = pollset;
+  watcher->worker = worker;
+  watcher->fd = fd;
+  gpr_mu_unlock(&fd->mu);
+
+  return mask;
+}
+
+static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *watcher,
+                        int got_read, int got_write) {
+  int was_polling = 0;
+  int kick = 0;
+  grpc_fd *fd = watcher->fd;
+
+  if (fd == NULL) {
+    return;
+  }
+
+  gpr_mu_lock(&fd->mu);
+
+  if (watcher == fd->read_watcher) {
+    /* remove read watcher, kick if we still need a read */
+    was_polling = 1;
+    if (!got_read) {
+      kick = 1;
+    }
+    fd->read_watcher = NULL;
+  }
+  if (watcher == fd->write_watcher) {
+    /* remove write watcher, kick if we still need a write */
+    was_polling = 1;
+    if (!got_write) {
+      kick = 1;
+    }
+    fd->write_watcher = NULL;
+  }
+  if (!was_polling && watcher->worker != NULL) {
+    /* remove from inactive list */
+    watcher->next->prev = watcher->prev;
+    watcher->prev->next = watcher->next;
+  }
+  if (got_read) {
+    if (set_ready_locked(exec_ctx, fd, &fd->read_closure)) {
+      kick = 1;
+    }
+  }
+  if (got_write) {
+    if (set_ready_locked(exec_ctx, fd, &fd->write_closure)) {
+      kick = 1;
+    }
+  }
+  if (kick) {
+    maybe_wake_one_watcher_locked(fd);
+  }
+  if (fd_is_orphaned(fd) && !has_watchers(fd) && !fd->closed) {
+    close_fd_locked(exec_ctx, fd);
+  }
+  gpr_mu_unlock(&fd->mu);
+
+  GRPC_FD_UNREF(fd, "poll");
+}
+
+static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) {
+  set_ready(exec_ctx, fd, &fd->read_closure);
+}
+
+static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) {
+  set_ready(exec_ctx, fd, &fd->write_closure);
+}
+
+/*******************************************************************************
+ * pollset_posix.c
+ */
+
+GPR_TLS_DECL(g_current_thread_poller);
+GPR_TLS_DECL(g_current_thread_worker);
+
+/** Default poll() function - a pointer so that it can be overridden by some
+ *  tests */
+grpc_poll_function_type grpc_poll_function = poll;
+
+/** The alarm system needs to be able to wakeup 'some poller' sometimes
+ *  (specifically when a new alarm needs to be triggered earlier than the next
+ *  alarm 'epoch').
+ *  This wakeup_fd gives us something to alert on when such a case occurs. */
+grpc_wakeup_fd grpc_global_wakeup_fd;
+
+static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev->next = worker->next;
+  worker->next->prev = worker->prev;
+}
+
+static int pollset_has_workers(grpc_pollset *p) {
+  return p->root_worker.next != &p->root_worker;
+}
+
+static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) {
+  if (pollset_has_workers(p)) {
+    grpc_pollset_worker *w = p->root_worker.next;
+    remove_worker(p, w);
+    return w;
+  } else {
+    return NULL;
+  }
+}
+
+static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->next = &p->root_worker;
+  worker->prev = worker->next->prev;
+  worker->prev->next = worker->next->prev = worker;
+}
+
+static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev = &p->root_worker;
+  worker->next = worker->prev->next;
+  worker->prev->next = worker->next->prev = worker;
+}
+
+static void pollset_kick_ext(grpc_pollset *p,
+                             grpc_pollset_worker *specific_worker,
+                             uint32_t flags) {
+  GPR_TIMER_BEGIN("pollset_kick_ext", 0);
+
+  /* pollset->mu already held */
+  if (specific_worker != NULL) {
+    if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) {
+      GPR_TIMER_BEGIN("pollset_kick_ext.broadcast", 0);
+      GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0);
+      for (specific_worker = p->root_worker.next;
+           specific_worker != &p->root_worker;
+           specific_worker = specific_worker->next) {
+        grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd);
+      }
+      p->kicked_without_pollers = 1;
+      GPR_TIMER_END("pollset_kick_ext.broadcast", 0);
+    } else if (gpr_tls_get(&g_current_thread_worker) !=
+               (intptr_t)specific_worker) {
+      GPR_TIMER_MARK("different_thread_worker", 0);
+      if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) {
+        specific_worker->reevaluate_polling_on_wakeup = 1;
+      }
+      specific_worker->kicked_specifically = 1;
+      grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd);
+    } else if ((flags & GRPC_POLLSET_CAN_KICK_SELF) != 0) {
+      GPR_TIMER_MARK("kick_yoself", 0);
+      if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) {
+        specific_worker->reevaluate_polling_on_wakeup = 1;
+      }
+      specific_worker->kicked_specifically = 1;
+      grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd);
+    }
+  } else if (gpr_tls_get(&g_current_thread_poller) != (intptr_t)p) {
+    GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0);
+    GPR_TIMER_MARK("kick_anonymous", 0);
+    specific_worker = pop_front_worker(p);
+    if (specific_worker != NULL) {
+      if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) {
+        GPR_TIMER_MARK("kick_anonymous_not_self", 0);
+        push_back_worker(p, specific_worker);
+        specific_worker = pop_front_worker(p);
+        if ((flags & GRPC_POLLSET_CAN_KICK_SELF) == 0 &&
+            gpr_tls_get(&g_current_thread_worker) ==
+                (intptr_t)specific_worker) {
+          push_back_worker(p, specific_worker);
+          specific_worker = NULL;
+        }
+      }
+      if (specific_worker != NULL) {
+        GPR_TIMER_MARK("finally_kick", 0);
+        push_back_worker(p, specific_worker);
+        grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd);
+      }
+    } else {
+      GPR_TIMER_MARK("kicked_no_pollers", 0);
+      p->kicked_without_pollers = 1;
+    }
+  }
+
+  GPR_TIMER_END("pollset_kick_ext", 0);
+}
+
+static void pollset_kick(grpc_pollset *p,
+                         grpc_pollset_worker *specific_worker) {
+  pollset_kick_ext(p, specific_worker, 0);
+}
+
+/* global state management */
+
+static void pollset_global_init(void) {
+  gpr_tls_init(&g_current_thread_poller);
+  gpr_tls_init(&g_current_thread_worker);
+  grpc_wakeup_fd_global_init();
+  grpc_wakeup_fd_init(&grpc_global_wakeup_fd);
+}
+
+static void pollset_global_shutdown(void) {
+  grpc_wakeup_fd_destroy(&grpc_global_wakeup_fd);
+  gpr_tls_destroy(&g_current_thread_poller);
+  gpr_tls_destroy(&g_current_thread_worker);
+  grpc_wakeup_fd_global_destroy();
+}
+
+static void kick_poller(void) { grpc_wakeup_fd_wakeup(&grpc_global_wakeup_fd); }
+
+/* main interface */
+
+static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null);
+
+static void pollset_init(grpc_pollset *pollset, gpr_mu *mu) {
+  pollset->mu = mu;
+  pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker;
+  pollset->in_flight_cbs = 0;
+  pollset->shutting_down = 0;
+  pollset->called_shutdown = 0;
+  pollset->kicked_without_pollers = 0;
+  pollset->idle_jobs.head = pollset->idle_jobs.tail = NULL;
+  pollset->local_wakeup_cache = NULL;
+  pollset->kicked_without_pollers = 0;
+  become_basic_pollset(pollset, NULL);
+}
+
+static void pollset_destroy(grpc_pollset *pollset) {
+  GPR_ASSERT(pollset->in_flight_cbs == 0);
+  GPR_ASSERT(!pollset_has_workers(pollset));
+  GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail);
+  pollset->vtable->destroy(pollset);
+  while (pollset->local_wakeup_cache) {
+    grpc_cached_wakeup_fd *next = pollset->local_wakeup_cache->next;
+    grpc_wakeup_fd_destroy(&pollset->local_wakeup_cache->fd);
+    gpr_free(pollset->local_wakeup_cache);
+    pollset->local_wakeup_cache = next;
+  }
+}
+
+static void pollset_reset(grpc_pollset *pollset) {
+  GPR_ASSERT(pollset->shutting_down);
+  GPR_ASSERT(pollset->in_flight_cbs == 0);
+  GPR_ASSERT(!pollset_has_workers(pollset));
+  GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail);
+  pollset->vtable->destroy(pollset);
+  pollset->shutting_down = 0;
+  pollset->called_shutdown = 0;
+  pollset->kicked_without_pollers = 0;
+  become_basic_pollset(pollset, NULL);
+}
+
+static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                           grpc_fd *fd) {
+  gpr_mu_lock(pollset->mu);
+  pollset->vtable->add_fd(exec_ctx, pollset, fd, 1);
+/* the following (enabled only in debug) will reacquire and then release
+   our lock - meaning that if the unlocking flag passed to add_fd above is
+   not respected, the code will deadlock (in a way that we have a chance of
+   debugging) */
+#ifndef NDEBUG
+  gpr_mu_lock(pollset->mu);
+  gpr_mu_unlock(pollset->mu);
+#endif
+}
+
+static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) {
+  GPR_ASSERT(grpc_closure_list_empty(pollset->idle_jobs));
+  pollset->vtable->finish_shutdown(pollset);
+  grpc_exec_ctx_enqueue(exec_ctx, pollset->shutdown_done, true, NULL);
+}
+
+static void pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                         grpc_pollset_worker **worker_hdl, gpr_timespec now,
+                         gpr_timespec deadline) {
+  grpc_pollset_worker worker;
+  *worker_hdl = &worker;
+
+  /* pollset->mu already held */
+  int added_worker = 0;
+  int locked = 1;
+  int queued_work = 0;
+  int keep_polling = 0;
+  GPR_TIMER_BEGIN("pollset_work", 0);
+  /* this must happen before we (potentially) drop pollset->mu */
+  worker.next = worker.prev = NULL;
+  worker.reevaluate_polling_on_wakeup = 0;
+  if (pollset->local_wakeup_cache != NULL) {
+    worker.wakeup_fd = pollset->local_wakeup_cache;
+    pollset->local_wakeup_cache = worker.wakeup_fd->next;
+  } else {
+    worker.wakeup_fd = gpr_malloc(sizeof(*worker.wakeup_fd));
+    grpc_wakeup_fd_init(&worker.wakeup_fd->fd);
+  }
+  worker.kicked_specifically = 0;
+  /* If there's work waiting for the pollset to be idle, and the
+     pollset is idle, then do that work */
+  if (!pollset_has_workers(pollset) &&
+      !grpc_closure_list_empty(pollset->idle_jobs)) {
+    GPR_TIMER_MARK("pollset_work.idle_jobs", 0);
+    grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL);
+    goto done;
+  }
+  /* If we're shutting down then we don't execute any extended work */
+  if (pollset->shutting_down) {
+    GPR_TIMER_MARK("pollset_work.shutting_down", 0);
+    goto done;
+  }
+  /* Give do_promote priority so we don't starve it out */
+  if (pollset->in_flight_cbs) {
+    GPR_TIMER_MARK("pollset_work.in_flight_cbs", 0);
+    gpr_mu_unlock(pollset->mu);
+    locked = 0;
+    goto done;
+  }
+  /* Start polling, and keep doing so while we're being asked to
+     re-evaluate our pollers (this allows poll() based pollers to
+     ensure they don't miss wakeups) */
+  keep_polling = 1;
+  while (keep_polling) {
+    keep_polling = 0;
+    if (!pollset->kicked_without_pollers) {
+      if (!added_worker) {
+        push_front_worker(pollset, &worker);
+        added_worker = 1;
+        gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker);
+      }
+      gpr_tls_set(&g_current_thread_poller, (intptr_t)pollset);
+      GPR_TIMER_BEGIN("maybe_work_and_unlock", 0);
+      pollset->vtable->maybe_work_and_unlock(exec_ctx, pollset, &worker,
+                                             deadline, now);
+      GPR_TIMER_END("maybe_work_and_unlock", 0);
+      locked = 0;
+      gpr_tls_set(&g_current_thread_poller, 0);
+    } else {
+      GPR_TIMER_MARK("pollset_work.kicked_without_pollers", 0);
+      pollset->kicked_without_pollers = 0;
+    }
+  /* Finished execution - start cleaning up.
+     Note that we may arrive here from outside the enclosing while() loop.
+     In that case we won't loop though as we haven't added worker to the
+     worker list, which means nobody could ask us to re-evaluate polling). */
+  done:
+    if (!locked) {
+      queued_work |= grpc_exec_ctx_flush(exec_ctx);
+      gpr_mu_lock(pollset->mu);
+      locked = 1;
+    }
+    /* If we're forced to re-evaluate polling (via pollset_kick with
+       GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) then we land here and force
+       a loop */
+    if (worker.reevaluate_polling_on_wakeup) {
+      worker.reevaluate_polling_on_wakeup = 0;
+      pollset->kicked_without_pollers = 0;
+      if (queued_work || worker.kicked_specifically) {
+        /* If there's queued work on the list, then set the deadline to be
+           immediate so we get back out of the polling loop quickly */
+        deadline = gpr_inf_past(GPR_CLOCK_MONOTONIC);
+      }
+      keep_polling = 1;
+    }
+  }
+  if (added_worker) {
+    remove_worker(pollset, &worker);
+    gpr_tls_set(&g_current_thread_worker, 0);
+  }
+  /* release wakeup fd to the local pool */
+  worker.wakeup_fd->next = pollset->local_wakeup_cache;
+  pollset->local_wakeup_cache = worker.wakeup_fd;
+  /* check shutdown conditions */
+  if (pollset->shutting_down) {
+    if (pollset_has_workers(pollset)) {
+      pollset_kick(pollset, NULL);
+    } else if (!pollset->called_shutdown && pollset->in_flight_cbs == 0) {
+      pollset->called_shutdown = 1;
+      gpr_mu_unlock(pollset->mu);
+      finish_shutdown(exec_ctx, pollset);
+      grpc_exec_ctx_flush(exec_ctx);
+      /* Continuing to access pollset here is safe -- it is the caller's
+       * responsibility to not destroy when it has outstanding calls to
+       * pollset_work.
+       * TODO(dklempner): Can we refactor the shutdown logic to avoid this? */
+      gpr_mu_lock(pollset->mu);
+    } else if (!grpc_closure_list_empty(pollset->idle_jobs)) {
+      grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL);
+      gpr_mu_unlock(pollset->mu);
+      grpc_exec_ctx_flush(exec_ctx);
+      gpr_mu_lock(pollset->mu);
+    }
+  }
+  *worker_hdl = NULL;
+  GPR_TIMER_END("pollset_work", 0);
+}
+
+static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                             grpc_closure *closure) {
+  GPR_ASSERT(!pollset->shutting_down);
+  pollset->shutting_down = 1;
+  pollset->shutdown_done = closure;
+  pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
+  if (!pollset_has_workers(pollset)) {
+    grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL);
+  }
+  if (!pollset->called_shutdown && pollset->in_flight_cbs == 0 &&
+      !pollset_has_workers(pollset)) {
+    pollset->called_shutdown = 1;
+    finish_shutdown(exec_ctx, pollset);
+  }
+}
+
+static int poll_deadline_to_millis_timeout(gpr_timespec deadline,
+                                           gpr_timespec now) {
+  gpr_timespec timeout;
+  static const int64_t max_spin_polling_us = 10;
+  if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) {
+    return -1;
+  }
+  if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros(
+                                                   max_spin_polling_us,
+                                                   GPR_TIMESPAN))) <= 0) {
+    return 0;
+  }
+  timeout = gpr_time_sub(deadline, now);
+  return gpr_time_to_millis(gpr_time_add(
+      timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN)));
+}
+
+/*
+ * basic_pollset - a vtable that provides polling for zero or one file
+ *                 descriptor via poll()
+ */
+
+typedef struct grpc_unary_promote_args {
+  const grpc_pollset_vtable *original_vtable;
+  grpc_pollset *pollset;
+  grpc_fd *fd;
+  grpc_closure promotion_closure;
+} grpc_unary_promote_args;
+
+static void basic_do_promote(grpc_exec_ctx *exec_ctx, void *args,
+                             bool success) {
+  grpc_unary_promote_args *up_args = args;
+  const grpc_pollset_vtable *original_vtable = up_args->original_vtable;
+  grpc_pollset *pollset = up_args->pollset;
+  grpc_fd *fd = up_args->fd;
+
+  /*
+   * This is quite tricky. There are a number of cases to keep in mind here:
+   * 1. fd may have been orphaned
+   * 2. The pollset may no longer be a unary poller (and we can't let case #1
+   * leak to other pollset types!)
+   * 3. pollset's fd (which may have changed) may have been orphaned
+   * 4. The pollset may be shutting down.
+   */
+
+  gpr_mu_lock(pollset->mu);
+  /* First we need to ensure that nobody is polling concurrently */
+  GPR_ASSERT(!pollset_has_workers(pollset));
+
+  gpr_free(up_args);
+  /* At this point the pollset may no longer be a unary poller. In that case
+   * we should just call the right add function and be done. */
+  /* TODO(klempner): If we're not careful this could cause infinite recursion.
+   * That's not a problem for now because empty_pollset has a trivial poller
+   * and we don't have any mechanism to unbecome multipoller. */
+  pollset->in_flight_cbs--;
+  if (pollset->shutting_down) {
+    /* We don't care about this pollset anymore. */
+    if (pollset->in_flight_cbs == 0 && !pollset->called_shutdown) {
+      pollset->called_shutdown = 1;
+      finish_shutdown(exec_ctx, pollset);
+    }
+  } else if (fd_is_orphaned(fd)) {
+    /* Don't try to add it to anything, we'll drop our ref on it below */
+  } else if (pollset->vtable != original_vtable) {
+    pollset->vtable->add_fd(exec_ctx, pollset, fd, 0);
+  } else if (fd != pollset->data.ptr) {
+    grpc_fd *fds[2];
+    fds[0] = pollset->data.ptr;
+    fds[1] = fd;
+
+    if (fds[0] && !fd_is_orphaned(fds[0])) {
+      platform_become_multipoller(exec_ctx, pollset, fds, GPR_ARRAY_SIZE(fds));
+      GRPC_FD_UNREF(fds[0], "basicpoll");
+    } else {
+      /* old fd is orphaned and we haven't cleaned it up until now, so remain a
+       * unary poller */
+      /* Note that it is possible that fds[1] is also orphaned at this point.
+       * That's okay, we'll correct it at the next add or poll. */
+      if (fds[0]) GRPC_FD_UNREF(fds[0], "basicpoll");
+      pollset->data.ptr = fd;
+      GRPC_FD_REF(fd, "basicpoll");
+    }
+  }
+
+  gpr_mu_unlock(pollset->mu);
+
+  /* Matching ref in basic_pollset_add_fd */
+  GRPC_FD_UNREF(fd, "basicpoll_add");
+}
+
+static void basic_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
+                                 grpc_fd *fd, int and_unlock_pollset) {
+  grpc_unary_promote_args *up_args;
+  GPR_ASSERT(fd);
+  if (fd == pollset->data.ptr) goto exit;
+
+  if (!pollset_has_workers(pollset)) {
+    /* Fast path -- no in flight cbs */
+    /* TODO(klempner): Comment this out and fix any test failures or establish
+     * they are due to timing issues */
+    grpc_fd *fds[2];
+    fds[0] = pollset->data.ptr;
+    fds[1] = fd;
+
+    if (fds[0] == NULL) {
+      pollset->data.ptr = fd;
+      GRPC_FD_REF(fd, "basicpoll");
+    } else if (!fd_is_orphaned(fds[0])) {
+      platform_become_multipoller(exec_ctx, pollset, fds, GPR_ARRAY_SIZE(fds));
+      GRPC_FD_UNREF(fds[0], "basicpoll");
+    } else {
+      /* old fd is orphaned and we haven't cleaned it up until now, so remain a
+       * unary poller */
+      GRPC_FD_UNREF(fds[0], "basicpoll");
+      pollset->data.ptr = fd;
+      GRPC_FD_REF(fd, "basicpoll");
+    }
+    goto exit;
+  }
+
+  /* Now we need to promote. This needs to happen when we're not polling. Since
+   * this may be called from poll, the wait needs to happen asynchronously. */
+  GRPC_FD_REF(fd, "basicpoll_add");
+  pollset->in_flight_cbs++;
+  up_args = gpr_malloc(sizeof(*up_args));
+  up_args->fd = fd;
+  up_args->original_vtable = pollset->vtable;
+  up_args->pollset = pollset;
+  up_args->promotion_closure.cb = basic_do_promote;
+  up_args->promotion_closure.cb_arg = up_args;
+
+  grpc_closure_list_add(&pollset->idle_jobs, &up_args->promotion_closure, 1);
+  pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
+
+exit:
+  if (and_unlock_pollset) {
+    gpr_mu_unlock(pollset->mu);
+  }
+}
+
+static void basic_pollset_maybe_work_and_unlock(grpc_exec_ctx *exec_ctx,
+                                                grpc_pollset *pollset,
+                                                grpc_pollset_worker *worker,
+                                                gpr_timespec deadline,
+                                                gpr_timespec now) {
+#define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR)
+#define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR)
+
+  struct pollfd pfd[3];
+  grpc_fd *fd;
+  grpc_fd_watcher fd_watcher;
+  int timeout;
+  int r;
+  nfds_t nfds;
+
+  fd = pollset->data.ptr;
+  if (fd && fd_is_orphaned(fd)) {
+    GRPC_FD_UNREF(fd, "basicpoll");
+    fd = pollset->data.ptr = NULL;
+  }
+  timeout = poll_deadline_to_millis_timeout(deadline, now);
+  pfd[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd);
+  pfd[0].events = POLLIN;
+  pfd[0].revents = 0;
+  pfd[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd);
+  pfd[1].events = POLLIN;
+  pfd[1].revents = 0;
+  nfds = 2;
+  if (fd) {
+    pfd[2].fd = fd->fd;
+    pfd[2].revents = 0;
+    GRPC_FD_REF(fd, "basicpoll_begin");
+    gpr_mu_unlock(pollset->mu);
+    pfd[2].events =
+        (short)fd_begin_poll(fd, pollset, worker, POLLIN, POLLOUT, &fd_watcher);
+    if (pfd[2].events != 0) {
+      nfds++;
+    }
+  } else {
+    gpr_mu_unlock(pollset->mu);
+  }
+
+  /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid
+     even going into the blocking annotation if possible */
+  /* poll fd count (argument 2) is shortened by one if we have no events
+     to poll on - such that it only includes the kicker */
+  GPR_TIMER_BEGIN("poll", 0);
+  GRPC_SCHEDULING_START_BLOCKING_REGION;
+  r = grpc_poll_function(pfd, nfds, timeout);
+  GRPC_SCHEDULING_END_BLOCKING_REGION;
+  GPR_TIMER_END("poll", 0);
+
+  if (r < 0) {
+    if (errno != EINTR) {
+      gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno));
+    }
+    if (fd) {
+      fd_end_poll(exec_ctx, &fd_watcher, 0, 0);
+    }
+  } else if (r == 0) {
+    if (fd) {
+      fd_end_poll(exec_ctx, &fd_watcher, 0, 0);
+    }
+  } else {
+    if (pfd[0].revents & POLLIN_CHECK) {
+      grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd);
+    }
+    if (pfd[1].revents & POLLIN_CHECK) {
+      grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd);
+    }
+    if (nfds > 2) {
+      fd_end_poll(exec_ctx, &fd_watcher, pfd[2].revents & POLLIN_CHECK,
+                  pfd[2].revents & POLLOUT_CHECK);
+    } else if (fd) {
+      fd_end_poll(exec_ctx, &fd_watcher, 0, 0);
+    }
+  }
+
+  if (fd) {
+    GRPC_FD_UNREF(fd, "basicpoll_begin");
+  }
+}
+
+static void basic_pollset_destroy(grpc_pollset *pollset) {
+  if (pollset->data.ptr != NULL) {
+    GRPC_FD_UNREF(pollset->data.ptr, "basicpoll");
+    pollset->data.ptr = NULL;
+  }
+}
+
+static const grpc_pollset_vtable basic_pollset = {
+    basic_pollset_add_fd, basic_pollset_maybe_work_and_unlock,
+    basic_pollset_destroy, basic_pollset_destroy};
+
+static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null) {
+  pollset->vtable = &basic_pollset;
+  pollset->data.ptr = fd_or_null;
+  if (fd_or_null != NULL) {
+    GRPC_FD_REF(fd_or_null, "basicpoll");
+  }
+}
+
+/*******************************************************************************
+ * pollset_multipoller_with_poll_posix.c
+ */
+
+typedef struct {
+  /* all polled fds */
+  size_t fd_count;
+  size_t fd_capacity;
+  grpc_fd **fds;
+  /* fds that have been removed from the pollset explicitly */
+  size_t del_count;
+  size_t del_capacity;
+  grpc_fd **dels;
+} poll_hdr;
+
+static void multipoll_with_poll_pollset_add_fd(grpc_exec_ctx *exec_ctx,
+                                               grpc_pollset *pollset,
+                                               grpc_fd *fd,
+                                               int and_unlock_pollset) {
+  size_t i;
+  poll_hdr *h = pollset->data.ptr;
+  /* TODO(ctiller): this is O(num_fds^2); maybe switch to a hash set here */
+  for (i = 0; i < h->fd_count; i++) {
+    if (h->fds[i] == fd) goto exit;
+  }
+  if (h->fd_count == h->fd_capacity) {
+    h->fd_capacity = GPR_MAX(h->fd_capacity + 8, h->fd_count * 3 / 2);
+    h->fds = gpr_realloc(h->fds, sizeof(grpc_fd *) * h->fd_capacity);
+  }
+  h->fds[h->fd_count++] = fd;
+  GRPC_FD_REF(fd, "multipoller");
+exit:
+  if (and_unlock_pollset) {
+    gpr_mu_unlock(pollset->mu);
+  }
+}
+
+static void multipoll_with_poll_pollset_maybe_work_and_unlock(
+    grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_pollset_worker *worker,
+    gpr_timespec deadline, gpr_timespec now) {
+#define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR)
+#define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR)
+
+  int timeout;
+  int r;
+  size_t i, j, fd_count;
+  nfds_t pfd_count;
+  poll_hdr *h;
+  /* TODO(ctiller): inline some elements to avoid an allocation */
+  grpc_fd_watcher *watchers;
+  struct pollfd *pfds;
+
+  h = pollset->data.ptr;
+  timeout = poll_deadline_to_millis_timeout(deadline, now);
+  /* TODO(ctiller): perform just one malloc here if we exceed the inline case */
+  pfds = gpr_malloc(sizeof(*pfds) * (h->fd_count + 2));
+  watchers = gpr_malloc(sizeof(*watchers) * (h->fd_count + 2));
+  fd_count = 0;
+  pfd_count = 2;
+  pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd);
+  pfds[0].events = POLLIN;
+  pfds[0].revents = 0;
+  pfds[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd);
+  pfds[1].events = POLLIN;
+  pfds[1].revents = 0;
+  for (i = 0; i < h->fd_count; i++) {
+    int remove = fd_is_orphaned(h->fds[i]);
+    for (j = 0; !remove && j < h->del_count; j++) {
+      if (h->fds[i] == h->dels[j]) remove = 1;
+    }
+    if (remove) {
+      GRPC_FD_UNREF(h->fds[i], "multipoller");
+    } else {
+      h->fds[fd_count++] = h->fds[i];
+      watchers[pfd_count].fd = h->fds[i];
+      pfds[pfd_count].fd = h->fds[i]->fd;
+      pfds[pfd_count].revents = 0;
+      pfd_count++;
+    }
+  }
+  for (j = 0; j < h->del_count; j++) {
+    GRPC_FD_UNREF(h->dels[j], "multipoller_del");
+  }
+  h->del_count = 0;
+  h->fd_count = fd_count;
+  gpr_mu_unlock(pollset->mu);
+
+  for (i = 2; i < pfd_count; i++) {
+    pfds[i].events = (short)fd_begin_poll(watchers[i].fd, pollset, worker,
+                                          POLLIN, POLLOUT, &watchers[i]);
+  }
+
+  /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid
+     even going into the blocking annotation if possible */
+  GRPC_SCHEDULING_START_BLOCKING_REGION;
+  r = grpc_poll_function(pfds, pfd_count, timeout);
+  GRPC_SCHEDULING_END_BLOCKING_REGION;
+
+  if (r < 0) {
+    if (errno != EINTR) {
+      gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno));
+    }
+    for (i = 2; i < pfd_count; i++) {
+      fd_end_poll(exec_ctx, &watchers[i], 0, 0);
+    }
+  } else if (r == 0) {
+    for (i = 2; i < pfd_count; i++) {
+      fd_end_poll(exec_ctx, &watchers[i], 0, 0);
+    }
+  } else {
+    if (pfds[0].revents & POLLIN_CHECK) {
+      grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd);
+    }
+    if (pfds[1].revents & POLLIN_CHECK) {
+      grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd);
+    }
+    for (i = 2; i < pfd_count; i++) {
+      if (watchers[i].fd == NULL) {
+        fd_end_poll(exec_ctx, &watchers[i], 0, 0);
+        continue;
+      }
+      fd_end_poll(exec_ctx, &watchers[i], pfds[i].revents & POLLIN_CHECK,
+                  pfds[i].revents & POLLOUT_CHECK);
+    }
+  }
+
+  gpr_free(pfds);
+  gpr_free(watchers);
+}
+
+static void multipoll_with_poll_pollset_finish_shutdown(grpc_pollset *pollset) {
+  size_t i;
+  poll_hdr *h = pollset->data.ptr;
+  for (i = 0; i < h->fd_count; i++) {
+    GRPC_FD_UNREF(h->fds[i], "multipoller");
+  }
+  for (i = 0; i < h->del_count; i++) {
+    GRPC_FD_UNREF(h->dels[i], "multipoller_del");
+  }
+  h->fd_count = 0;
+  h->del_count = 0;
+}
+
+static void multipoll_with_poll_pollset_destroy(grpc_pollset *pollset) {
+  poll_hdr *h = pollset->data.ptr;
+  multipoll_with_poll_pollset_finish_shutdown(pollset);
+  gpr_free(h->fds);
+  gpr_free(h->dels);
+  gpr_free(h);
+}
+
+static const grpc_pollset_vtable multipoll_with_poll_pollset = {
+    multipoll_with_poll_pollset_add_fd,
+    multipoll_with_poll_pollset_maybe_work_and_unlock,
+    multipoll_with_poll_pollset_finish_shutdown,
+    multipoll_with_poll_pollset_destroy};
+
+static void poll_become_multipoller(grpc_exec_ctx *exec_ctx,
+                                    grpc_pollset *pollset, grpc_fd **fds,
+                                    size_t nfds) {
+  size_t i;
+  poll_hdr *h = gpr_malloc(sizeof(poll_hdr));
+  pollset->vtable = &multipoll_with_poll_pollset;
+  pollset->data.ptr = h;
+  h->fd_count = nfds;
+  h->fd_capacity = nfds;
+  h->fds = gpr_malloc(nfds * sizeof(grpc_fd *));
+  h->del_count = 0;
+  h->del_capacity = 0;
+  h->dels = NULL;
+  for (i = 0; i < nfds; i++) {
+    h->fds[i] = fds[i];
+    GRPC_FD_REF(fds[i], "multipoller");
+  }
+}
+
+/*******************************************************************************
+ * pollset_set_posix.c
+ */
+
+static grpc_pollset_set *pollset_set_create(void) {
+  grpc_pollset_set *pollset_set = gpr_malloc(sizeof(*pollset_set));
+  memset(pollset_set, 0, sizeof(*pollset_set));
+  gpr_mu_init(&pollset_set->mu);
+  return pollset_set;
+}
+
+static void pollset_set_destroy(grpc_pollset_set *pollset_set) {
+  size_t i;
+  gpr_mu_destroy(&pollset_set->mu);
+  for (i = 0; i < pollset_set->fd_count; i++) {
+    GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set");
+  }
+  gpr_free(pollset_set->pollsets);
+  gpr_free(pollset_set->pollset_sets);
+  gpr_free(pollset_set->fds);
+  gpr_free(pollset_set);
+}
+
+static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx,
+                                    grpc_pollset_set *pollset_set,
+                                    grpc_pollset *pollset) {
+  size_t i, j;
+  gpr_mu_lock(&pollset_set->mu);
+  if (pollset_set->pollset_count == pollset_set->pollset_capacity) {
+    pollset_set->pollset_capacity =
+        GPR_MAX(8, 2 * pollset_set->pollset_capacity);
+    pollset_set->pollsets =
+        gpr_realloc(pollset_set->pollsets, pollset_set->pollset_capacity *
+                                               sizeof(*pollset_set->pollsets));
+  }
+  pollset_set->pollsets[pollset_set->pollset_count++] = pollset;
+  for (i = 0, j = 0; i < pollset_set->fd_count; i++) {
+    if (fd_is_orphaned(pollset_set->fds[i])) {
+      GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set");
+    } else {
+      pollset_add_fd(exec_ctx, pollset, pollset_set->fds[i]);
+      pollset_set->fds[j++] = pollset_set->fds[i];
+    }
+  }
+  pollset_set->fd_count = j;
+  gpr_mu_unlock(&pollset_set->mu);
+}
+
+static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx,
+                                    grpc_pollset_set *pollset_set,
+                                    grpc_pollset *pollset) {
+  size_t i;
+  gpr_mu_lock(&pollset_set->mu);
+  for (i = 0; i < pollset_set->pollset_count; i++) {
+    if (pollset_set->pollsets[i] == pollset) {
+      pollset_set->pollset_count--;
+      GPR_SWAP(grpc_pollset *, pollset_set->pollsets[i],
+               pollset_set->pollsets[pollset_set->pollset_count]);
+      break;
+    }
+  }
+  gpr_mu_unlock(&pollset_set->mu);
+}
+
+static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx,
+                                        grpc_pollset_set *bag,
+                                        grpc_pollset_set *item) {
+  size_t i, j;
+  gpr_mu_lock(&bag->mu);
+  if (bag->pollset_set_count == bag->pollset_set_capacity) {
+    bag->pollset_set_capacity = GPR_MAX(8, 2 * bag->pollset_set_capacity);
+    bag->pollset_sets =
+        gpr_realloc(bag->pollset_sets,
+                    bag->pollset_set_capacity * sizeof(*bag->pollset_sets));
+  }
+  bag->pollset_sets[bag->pollset_set_count++] = item;
+  for (i = 0, j = 0; i < bag->fd_count; i++) {
+    if (fd_is_orphaned(bag->fds[i])) {
+      GRPC_FD_UNREF(bag->fds[i], "pollset_set");
+    } else {
+      pollset_set_add_fd(exec_ctx, item, bag->fds[i]);
+      bag->fds[j++] = bag->fds[i];
+    }
+  }
+  bag->fd_count = j;
+  gpr_mu_unlock(&bag->mu);
+}
+
+static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx,
+                                        grpc_pollset_set *bag,
+                                        grpc_pollset_set *item) {
+  size_t i;
+  gpr_mu_lock(&bag->mu);
+  for (i = 0; i < bag->pollset_set_count; i++) {
+    if (bag->pollset_sets[i] == item) {
+      bag->pollset_set_count--;
+      GPR_SWAP(grpc_pollset_set *, bag->pollset_sets[i],
+               bag->pollset_sets[bag->pollset_set_count]);
+      break;
+    }
+  }
+  gpr_mu_unlock(&bag->mu);
+}
+
+static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx,
+                               grpc_pollset_set *pollset_set, grpc_fd *fd) {
+  size_t i;
+  gpr_mu_lock(&pollset_set->mu);
+  if (pollset_set->fd_count == pollset_set->fd_capacity) {
+    pollset_set->fd_capacity = GPR_MAX(8, 2 * pollset_set->fd_capacity);
+    pollset_set->fds = gpr_realloc(
+        pollset_set->fds, pollset_set->fd_capacity * sizeof(*pollset_set->fds));
+  }
+  GRPC_FD_REF(fd, "pollset_set");
+  pollset_set->fds[pollset_set->fd_count++] = fd;
+  for (i = 0; i < pollset_set->pollset_count; i++) {
+    pollset_add_fd(exec_ctx, pollset_set->pollsets[i], fd);
+  }
+  for (i = 0; i < pollset_set->pollset_set_count; i++) {
+    pollset_set_add_fd(exec_ctx, pollset_set->pollset_sets[i], fd);
+  }
+  gpr_mu_unlock(&pollset_set->mu);
+}
+
+static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx,
+                               grpc_pollset_set *pollset_set, grpc_fd *fd) {
+  size_t i;
+  gpr_mu_lock(&pollset_set->mu);
+  for (i = 0; i < pollset_set->fd_count; i++) {
+    if (pollset_set->fds[i] == fd) {
+      pollset_set->fd_count--;
+      GPR_SWAP(grpc_fd *, pollset_set->fds[i],
+               pollset_set->fds[pollset_set->fd_count]);
+      GRPC_FD_UNREF(fd, "pollset_set");
+      break;
+    }
+  }
+  for (i = 0; i < pollset_set->pollset_set_count; i++) {
+    pollset_set_del_fd(exec_ctx, pollset_set->pollset_sets[i], fd);
+  }
+  gpr_mu_unlock(&pollset_set->mu);
+}
+
+/*******************************************************************************
+ * event engine binding
+ */
+
+static void shutdown_engine(void) {
+  fd_global_shutdown();
+  pollset_global_shutdown();
+}
+
+static const grpc_event_engine_vtable vtable = {
+    .pollset_size = sizeof(grpc_pollset),
+
+    .fd_create = fd_create,
+    .fd_wrapped_fd = fd_wrapped_fd,
+    .fd_orphan = fd_orphan,
+    .fd_shutdown = fd_shutdown,
+    .fd_notify_on_read = fd_notify_on_read,
+    .fd_notify_on_write = fd_notify_on_write,
+
+    .pollset_init = pollset_init,
+    .pollset_shutdown = pollset_shutdown,
+    .pollset_reset = pollset_reset,
+    .pollset_destroy = pollset_destroy,
+    .pollset_work = pollset_work,
+    .pollset_kick = pollset_kick,
+    .pollset_add_fd = pollset_add_fd,
+
+    .pollset_set_create = pollset_set_create,
+    .pollset_set_destroy = pollset_set_destroy,
+    .pollset_set_add_pollset = pollset_set_add_pollset,
+    .pollset_set_del_pollset = pollset_set_del_pollset,
+    .pollset_set_add_pollset_set = pollset_set_add_pollset_set,
+    .pollset_set_del_pollset_set = pollset_set_del_pollset_set,
+    .pollset_set_add_fd = pollset_set_add_fd,
+    .pollset_set_del_fd = pollset_set_del_fd,
+
+    .kick_poller = kick_poller,
+
+    .shutdown_engine = shutdown_engine,
+};
+
+const grpc_event_engine_vtable *grpc_init_poll_posix(void) {
+  fd_global_init();
+  pollset_global_init();
+  return &vtable;
+}
+
+#endif
diff --git a/src/core/iomgr/ev_poll_posix.h b/src/core/iomgr/ev_poll_posix.h
new file mode 100644
index 0000000000..39dbc16442
--- /dev/null
+++ b/src/core/iomgr/ev_poll_posix.h
@@ -0,0 +1,41 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_IOMGR_EV_POLL_POSIX_H
+#define GRPC_INTERNAL_CORE_IOMGR_EV_POLL_POSIX_H
+
+#include "src/core/iomgr/ev_posix.h"
+
+const grpc_event_engine_vtable *grpc_init_poll_posix(void);
+
+#endif  // GRPC_INTERNAL_CORE_IOMGR_EV_POLL_AND_EPOLL_POSIX_H
diff --git a/src/core/iomgr/ev_posix.c b/src/core/iomgr/ev_posix.c
index 4229d8d2e4..127ab4b181 100644
--- a/src/core/iomgr/ev_posix.c
+++ b/src/core/iomgr/ev_posix.c
@@ -33,18 +33,93 @@
 
 #include "src/core/iomgr/ev_posix.h"
 
+#include <string.h>
+
+#include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/useful.h>
 
 #include "src/core/iomgr/ev_poll_and_epoll_posix.h"
+#include "src/core/iomgr/ev_poll_posix.h"
+#include "src/core/support/env.h"
 
 static const grpc_event_engine_vtable *g_event_engine;
 
+typedef const grpc_event_engine_vtable *(*event_engine_factory_fn)(void);
+
+typedef struct {
+  const char *name;
+  event_engine_factory_fn factory;
+} event_engine_factory;
+
+static const event_engine_factory g_factories[] = {
+    {"poll", grpc_init_poll_posix}, {"legacy", grpc_init_poll_and_epoll_posix},
+};
+
+static void add(const char *beg, const char *end, char ***ss, size_t *ns) {
+  size_t n = *ns;
+  size_t np = n + 1;
+  char *s;
+  size_t len;
+  GPR_ASSERT(end >= beg);
+  len = (size_t)(end - beg);
+  s = gpr_malloc(len + 1);
+  memcpy(s, beg, len);
+  s[len] = 0;
+  *ss = gpr_realloc(*ss, sizeof(char **) * np);
+  (*ss)[n] = s;
+  *ns = np;
+}
+
+static void split(const char *s, char ***ss, size_t *ns) {
+  const char *c = strchr(s, ',');
+  if (c == NULL) {
+    add(s, s + strlen(s), ss, ns);
+  } else {
+    add(s, c, ss, ns);
+    split(c + 1, ss, ns);
+  }
+}
+
+static bool is(const char *want, const char *have) {
+  return 0 == strcmp(want, "all") || 0 == strcmp(want, have);
+}
+
+static void try_engine(const char *engine) {
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(g_factories); i++) {
+    if (is(engine, g_factories[i].name)) {
+      if ((g_event_engine = g_factories[i].factory())) {
+        return;
+      }
+    }
+  }
+}
+
 void grpc_event_engine_init(void) {
-  if ((g_event_engine = grpc_init_poll_and_epoll_posix())) {
-    return;
+  char *s = gpr_getenv("GRPC_POLL_STRATEGY");
+  if (s == NULL) {
+    s = gpr_strdup("all");
+  }
+
+  char **strings = NULL;
+  size_t nstrings = 0;
+  split(s, &strings, &nstrings);
+
+  for (size_t i = 0; g_event_engine == NULL && i < nstrings; i++) {
+    try_engine(strings[i]);
+  }
+
+  for (size_t i = 0; i < nstrings; i++) {
+    gpr_free(strings[i]);
+  }
+  gpr_free(strings);
+  gpr_free(s);
+
+  if (g_event_engine == NULL) {
+    gpr_log(GPR_ERROR, "No event engine could be initialized");
+    abort();
   }
-  gpr_log(GPR_ERROR, "No event engine could be initialized");
-  abort();
 }
 
 void grpc_event_engine_shutdown(void) { g_event_engine->shutdown_engine(); }
diff --git a/test/core/end2end/gen_build_yaml.py b/test/core/end2end/gen_build_yaml.py
index 330d153415..971457ddcf 100755
--- a/test/core/end2end/gen_build_yaml.py
+++ b/test/core/end2end/gen_build_yaml.py
@@ -47,6 +47,15 @@ default_secure_fixture_options = default_unsecure_fixture_options._replace(secur
 uds_fixture_options = default_unsecure_fixture_options._replace(dns_resolver=False, platforms=['linux', 'mac', 'posix'])
 
 
+# map a platform to available polling strategies
+POLLING_STRATEGY = {
+'windows': ['all'],
+'linux': ['poll', 'legacy'],
+'mac': ['poll'],
+'posix': ['poll'],
+}
+
+
 # maps fixture name to whether it requires the security library
 END2END_FIXTURES = {
     'h2_compress': default_unsecure_fixture_options,
@@ -241,17 +250,22 @@ def main():
           {
               'name': '%s_test' % f,
               'args': [t],
+              'env': {
+                'GRPC_POLL_STRATEGY': poll_strategy
+              },
               'exclude_configs': [],
-              'platforms': END2END_FIXTURES[f].platforms,
-              'ci_platforms': (END2END_FIXTURES[f].platforms
-                               if END2END_FIXTURES[f].ci_mac else without(
-                                   END2END_FIXTURES[f].platforms, 'mac')),
+              'platforms': [platform],
+              'ci_platforms': [platform],
               'flaky': False,
               'language': 'c',
               'cpu_cost': END2END_TESTS[t].cpu_cost,
           }
           for f in sorted(END2END_FIXTURES.keys())
-          for t in sorted(END2END_TESTS.keys()) if compatible(f, t)
+          for t in sorted(END2END_TESTS.keys())
+          for platform in sorted(END2END_FIXTURES[f].platforms)
+          for poll_strategy in POLLING_STRATEGY[platform]
+          if compatible(f, t)
+          and (END2END_FIXTURES[f].ci_mac or platform != 'mac')
       ] + [
           {
               'name': '%s_nosec_test' % f,
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 7b2bc53716..b6810e83a2 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -159,13 +159,21 @@ class CLanguage(object):
             target['name'])
       else:
         binary = 'bins/%s/%s' % (self.config.build_config, target['name'])
+      env = {}
+      shortname = ' '.join(cmdline)
+      if 'env' in target:
+        tenv = target['env']
+        env.update(tenv)
+        shortname += ' '
+        shortname += ' '.join('%s=%s' % (key, tenv[key]) for key in sorted(tenv.keys()))
+      env['GRPC_DEFAULT_SSL_ROOTS_FILE_PATH'] = (
+          _ROOT + '/src/core/tsi/test_creds/ca.pem')
       if os.path.isfile(binary):
         cmdline = [binary] + target['args']
         out.append(self.config.job_spec(cmdline, [binary],
                                         shortname=' '.join(cmdline),
                                         cpu_cost=target['cpu_cost'],
-                                        environ={'GRPC_DEFAULT_SSL_ROOTS_FILE_PATH':
-                                                 _ROOT + '/src/core/tsi/test_creds/ca.pem'}))
+                                        environ=env))
       elif self.args.regex == '.*' or self.platform == 'windows':
         print '\nWARNING: binary not found, skipping', binary
     return sorted(out)
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index 2f514bfc00..a3195277b6 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -4042,966 +4042,834 @@
       "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
@@ -5010,21 +4878,18 @@
       "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
@@ -5032,949 +4897,834 @@
       "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_compress_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
@@ -5983,20 +5733,18 @@
       "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
@@ -6004,948 +5752,834 @@
       "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
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     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "large_metadata"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "posix"
+      "mac"
     ], 
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+    "env": {
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+    }, 
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     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
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   {
     "args": [
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+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
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+    "env": {
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+    }, 
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     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "max_message_length"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
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     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
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+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
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+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_fakesec_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
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+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
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+    "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
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+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
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+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
@@ -6954,21 +6588,18 @@
       "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
@@ -6976,757 +6607,835 @@
       "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
       "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
       "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "simple_metadata"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "simple_metadata"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "simple_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "simple_request"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
       "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
       "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
       "linux"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "posix"
     ]
   }, 
   {
@@ -7734,15 +7443,18 @@
       "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_full+pipe_test", 
+    "name": "h2_census_test", 
     "platforms": [
-      "linux"
+      "windows"
     ]
   }, 
   {
@@ -7750,922 +7462,834 @@
       "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "cancel_after_accept"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "cancel_after_client_done"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "cancel_after_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "cancel_before_invoke"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_oauth2_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "cancel_in_a_vacuum"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
@@ -8674,713 +8298,645 @@
       "cancel_with_status"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "default_host"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_proxy_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
@@ -9388,816 +8944,721 @@
       "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
@@ -10205,787 +9666,702 @@
       "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair+trace_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
@@ -10993,1148 +10369,30304 @@
       "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_sockpair_1byte_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
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     "args": [
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+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
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+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
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     "args": [
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+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
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+    }, 
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     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
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     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 0.1, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "simple_metadata"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_metadata"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
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+    "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "simple_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "simple_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
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+      "trailing_metadata"
     ], 
     "ci_platforms": [
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-      "linux", 
-      "mac", 
       "posix"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
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+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_compress_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "bad_hostname"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
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+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
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+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "binary_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
   }, 
   {
     "args": [
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+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
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+    "cpu_cost": 1.0, 
+    "env": {
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_test", 
+    "name": "h2_fakesec_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "call_creds"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "all"
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     "language": "c", 
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     "platforms": [
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-      "linux", 
-      "mac", 
-      "posix"
+      "windows"
     ]
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+      "cancel_after_accept"
     ], 
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-      "linux", 
-      "mac", 
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     "language": "c", 
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     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
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     "args": [
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+      "cancel_after_accept"
     ], 
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-      "linux", 
-      "mac", 
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     "language": "c", 
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-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
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       "posix"
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    ]
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+    "name": "h2_fakesec_test", 
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+    ]
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    ]
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+    "name": "h2_fakesec_test", 
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+    ]
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+    "language": "c", 
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    "name": "h2_fakesec_test", 
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+    "language": "c", 
+    "name": "h2_fakesec_test", 
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+    "language": "c", 
+    "name": "h2_uds_test", 
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     ]
   }, 
   {
     "args": [
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+      "cancel_in_a_vacuum"
     ], 
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-      "linux", 
       "posix"
     ], 
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
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+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
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+      "cancel_with_status"
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+    "name": "h2_uds_test", 
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+    "name": "h2_uds_test", 
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+    "name": "h2_uds_test", 
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       "posix"
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+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "compressed_payload"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "compressed_payload"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "compressed_payload"
+    ], 
+    "ci_platforms": [
+      "mac"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "mac"
+    ]
+  }, 
+  {
+    "args": [
+      "compressed_payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "connectivity"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "connectivity"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "connectivity"
+    ], 
+    "ci_platforms": [
+      "mac"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "mac"
+    ]
+  }, 
+  {
+    "args": [
+      "connectivity"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "disappearing_server"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "disappearing_server"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "disappearing_server"
+    ], 
+    "ci_platforms": [
+      "mac"
+    ], 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "mac"
+    ]
+  }, 
+  {
+    "args": [
+      "disappearing_server"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "empty_batch"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "empty_batch"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "default_host"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
@@ -12142,19 +40674,17 @@
       "graceful_server_shutdown"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
@@ -12163,1718 +40693,1576 @@
       "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "high_initial_seqno"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "hpack_size"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "invoke_large_request"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "large_metadata"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_ssl_proxy_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "max_concurrent_streams"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "max_message_length"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "negative_deadline"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "no_op"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
+    ]
+  }, 
+  {
+    "args": [
+      "payload"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
+    "exclude_configs": [], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "h2_uds_test", 
+    "platforms": [
+      "linux"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "payload"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "ping"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "ping_pong_streaming"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "registered_call"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "trailing_metadata"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
-    "name": "h2_uchannel_test", 
+    "name": "h2_uds_test", 
     "platforms": [
-      "windows", 
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "bad_hostname"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "binary_metadata"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "call_creds"
+      "request_with_flags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_after_accept"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_client_done"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_after_invoke"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "cancel_before_invoke"
+      "request_with_payload"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "cancel_in_a_vacuum"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "cancel_with_status"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "compressed_payload"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "connectivity"
+      "server_finishes_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "disappearing_server"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "empty_batch"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "graceful_server_shutdown"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "high_initial_seqno"
+      "shutdown_finishes_calls"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "hpack_size"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "invoke_large_request"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "large_metadata"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "max_concurrent_streams"
+      "shutdown_finishes_tags"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "max_message_length"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "negative_deadline"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "no_op"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
-    "cpu_cost": 1.0, 
+    "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "payload"
+      "simple_delayed_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 0.1, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "ping"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "ping_pong_streaming"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "registered_call"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "request_with_flags"
+      "simple_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "request_with_payload"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "server_finishes_request"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_calls"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
     "args": [
-      "shutdown_finishes_tags"
+      "simple_request"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
   {
     "args": [
-      "simple_delayed_request"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
-    "cpu_cost": 0.1, 
+    "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_metadata"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "legacy"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "linux"
     ]
   }, 
   {
     "args": [
-      "simple_request"
+      "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
-      "posix"
+      "mac"
     ]
   }, 
   {
@@ -13882,18 +42270,17 @@
       "trailing_metadata"
     ], 
     "ci_platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ], 
     "cpu_cost": 1.0, 
+    "env": {
+      "GRPC_POLL_STRATEGY": "poll"
+    }, 
     "exclude_configs": [], 
     "flaky": false, 
     "language": "c", 
     "name": "h2_uds_test", 
     "platforms": [
-      "linux", 
-      "mac", 
       "posix"
     ]
   }, 
-- 
GitLab