diff options
| author | Thomas Munro | 2022-03-16 00:37:58 +0000 |
|---|---|---|
| committer | Thomas Munro | 2022-03-16 00:57:59 +0000 |
| commit | 5e6368b42ee6d4b59e085301ca7b0e50f37a897b (patch) | |
| tree | 770884f4f9157bb286c3b86d6f7aa2040ab2d5ce /src/include | |
| parent | a56e7b66010f330782243de9e25ac2a6596be0e1 (diff) | |
Wake up for latches in CheckpointWriteDelay().
The checkpointer shouldn't ignore its latch. Other backends may be
waiting for it to drain the request queue. Hopefully real systems don't
have a full queue often, but the condition is reached easily when
shared_buffers is small.
This involves defining a new wait event, which will appear in the
pg_stat_activity view often due to spread checkpoints.
Back-patch only to 14. Even though the problem exists in earlier
branches too, it's hard to hit there. In 14 we stopped using signal
handlers for latches on Linux, *BSD and macOS, which were previously
hiding this problem by interrupting the sleep (though not reliably, as
the signal could arrive before the sleep begins; precisely the problem
latches address).
Reported-by: Andres Freund <[email protected]>
Reviewed-by: Andres Freund <[email protected]>
Discussion: https://postgr.es/m/20220226213942.nb7uvb2pamyu26dj%40alap3.anarazel.de
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/utils/wait_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/utils/wait_event.h b/src/include/utils/wait_event.h index 395d325c5fe..d0345c6b49e 100644 --- a/src/include/utils/wait_event.h +++ b/src/include/utils/wait_event.h @@ -141,6 +141,7 @@ typedef enum typedef enum { WAIT_EVENT_BASE_BACKUP_THROTTLE = PG_WAIT_TIMEOUT, + WAIT_EVENT_CHECKPOINT_WRITE_DELAY, WAIT_EVENT_PG_SLEEP, WAIT_EVENT_RECOVERY_APPLY_DELAY, WAIT_EVENT_RECOVERY_RETRIEVE_RETRY_INTERVAL, |