Add in a racy check for min deadline in run_some_expired_alarms before

attempting
the trylock. This shaves the number of g_mu and g_checker_mu uses dramatically in perf test workload and all tests still pass.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/core/iomgr/alarm.c b/src/core/iomgr/alarm.c
index 5860834de3..3b7092449a 100644
--- a/src/core/iomgr/alarm.c
+++ b/src/core/iomgr/alarm.c
@@ -307,6 +307,10 @@ static int run_some_expired_alarms(gpr_mu *drop_mu, gpr_timespec now,
 
   /* TODO(ctiller): verify that there are any alarms (atomically) here */
 
+  if (gpr_time_cmp(g_shard_queue[0]->min_deadline, now) >= 0) {
+    return 0;
+  }
+
   if (gpr_mu_trylock(&g_checker_mu)) {
     gpr_mu_lock(&g_mu);