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Add wait events for checkpoint delay mechanism.

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When MyProc->delayChkptFlags is set to temporarily block phase
transitions in a concurrent checkpoint, the checkpointer enters a
sleep-poll loop to wait for the flag to be cleared.  We should show that
as a wait event in the pg_stat_activity view.

Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CA%2BhUKGL7Whi8iwKbzkbn_1fixH3Yy8aAPz7mfq6Hpj7FeJrKMg%40mail.gmail.com
This commit is contained in:
Thomas Munro 2023-10-13 16:43:22 +13:00
parent 7e1f544827
commit 0013ba290b
2 changed files with 6 additions and 0 deletions
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4
src/backend/access/transam/xlog.c
View File

@ -6737,7 +6737,9 @@ CreateCheckPoint(int flags)
{
do
{
pgstat_report_wait_start(WAIT_EVENT_CHECKPOINT_DELAY_START);
pg_usleep(10000L); /* wait for 10 msec */
pgstat_report_wait_end();
} while (HaveVirtualXIDsDelayingChkpt(vxids, nvxids,
DELAY_CHKPT_START));
}
@ -6750,7 +6752,9 @@ CreateCheckPoint(int flags)
{
do
{
pgstat_report_wait_start(WAIT_EVENT_CHECKPOINT_DELAY_COMPLETE);
pg_usleep(10000L); /* wait for 10 msec */
pgstat_report_wait_end();
} while (HaveVirtualXIDsDelayingChkpt(vxids, nvxids,
DELAY_CHKPT_COMPLETE));
}

2
src/backend/utils/activity/wait_event_names.txt
View File

@ -97,6 +97,8 @@ BGWORKER_SHUTDOWN "Waiting for background worker to shut down."
BGWORKER_STARTUP "Waiting for background worker to start up."
BTREE_PAGE "Waiting for the page number needed to continue a parallel B-tree scan to become available."
BUFFER_IO "Waiting for buffer I/O to complete."
CHECKPOINT_DELAY_COMPLETE "Waiting for a backend that blocks a checkpoint from completing."
CHECKPOINT_DELAY_START "Waiting for a backend that blocks a checkpoint from starting."
CHECKPOINT_DONE "Waiting for a checkpoint to complete."
CHECKPOINT_START "Waiting for a checkpoint to start."
EXECUTE_GATHER "Waiting for activity from a child process while executing a <literal>Gather</literal> plan node."