postgres.git / summary / log / commit / refs

commit    3cb5808bd11c5a7ef697922335f7642f643a4e7f
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Tue Dec 09 15:06:40 2025 +0000

    Add wait event for the group commit delay before WAL flush
    
    Author: Rafia Sabih <rafia.pghackers@gmail.com>
    Reviewed-by: Sami Imseih <samimseih@gmail.com>
    Discussion: https://www.postgresql.org/message-id/CA%2BFpmFf-hWXtrC0Q3Cr_Xo78zuP_M_VC5xgWPOYOkwqOD0T8eg@mail.gmail.com


 src/backend/access/transam/xlog.c               | 2 ++
 src/backend/utils/activity/wait_event_names.txt | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 6ced1d57282..fb05e8e136d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2884,7 +2884,9 @@ XLogFlush(XLogRecPtr record)
 		if (CommitDelay > 0 && enableFsync &&
 			MinimumActiveBackends(CommitSiblings))
 		{
+			pgstat_report_wait_start(WAIT_EVENT_COMMIT_DELAY);
 			pg_usleep(CommitDelay);
+			pgstat_report_wait_end();
 
 			/*
 			 * Re-check how far we can now flush the WAL. It's generally not
diff --git a/src/backend/utils/activity/wait_event_names.txt b/src/backend/utils/activity/wait_event_names.txt
index 1e5e368a5dc..f39830dbb34 100644
--- a/src/backend/utils/activity/wait_event_names.txt
+++ b/src/backend/utils/activity/wait_event_names.txt
@@ -175,6 +175,7 @@ Section: ClassName - WaitEventTimeout
 
 BASE_BACKUP_THROTTLE	"Waiting during base backup when throttling activity."
 CHECKPOINT_WRITE_DELAY	"Waiting between writes while performing a checkpoint."
+COMMIT_DELAY	"Waiting for commit delay before WAL flush."
 PG_SLEEP	"Waiting due to a call to <function>pg_sleep</function> or a sibling function."
 RECOVERY_APPLY_DELAY	"Waiting to apply WAL during recovery because of a delay setting."
 RECOVERY_RETRIEVE_RETRY_INTERVAL	"Waiting during recovery when WAL data is not available from any source (<filename>pg_wal</filename>, archive or stream)."


[parent: f231a4e8c7f2]