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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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src/backend/utils/activity/wait_event_names.txt
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@@ -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."