Report time spent in posix_fallocate() as a wait event.

macdice · macdice · commit ef02fb15a35a · 2020-01-31T17:29:41.000+13:00
When allocating DSM segments with posix_fallocate() on Linux (see commit 899bd78), report this activity as a wait event exactly as we would if we were using file-backed DSM rather than shm_open()-backed DSM. Author: Thomas Munro Discussion: https://postgr.es/m/CA%2BhUKGKCSh4GARZrJrQZwqs5SYp0xDMRr9Bvb%2BHQzJKvRgL6ZA%40mail.gmail.com
diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c
@@ -371,10 +371,12 @@ dsm_impl_posix_resize(int fd, off_t size)
 		 * interrupt pending.  This avoids the possibility of looping forever
 		 * if another backend is repeatedly trying to interrupt us.
 		 */
+		pgstat_report_wait_start(WAIT_EVENT_DSM_FILL_ZERO_WRITE);
 		do
 		{
 			rc = posix_fallocate(fd, 0, size);
 		} while (rc == EINTR && !(ProcDiePending || QueryCancelPending));
+		pgstat_report_wait_end();
 
 		/*
 		 * The caller expects errno to be set, but posix_fallocate() doesn't
