v2-0001-Move-WAIT_FOR_WAL_-wait-events-from-Client-to-IPC.patch

From 85caff7bccfcef5f8140f29fff7f8b988f8d92a4 Mon Sep 17 00:00:00 2001
From: Alexander Korotkov <akorotkov@postgresql.org>
Date: Tue, 7 Jul 2026 17:32:47 +0300
Subject: [PATCH v2] Move WAIT_FOR_WAL_* wait events from Client to IPC class

WAIT_FOR_WAL_FLUSH, WAIT_FOR_WAL_REPLAY, and WAIT_FOR_WAL_WRITE were
placed in the WaitEventClient class.  But WaitEventClient is about
waiting for a socket to become readable or writable, while these events
have other delay sources as well: local fsync and local replay, which
may be disk- or CPU-bound.  WaitEventIPC is a better fit, so move them
there.

Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20260706012642.f9.noahmisch@microsoft.com
Backpatch-through: 19
---
 src/backend/utils/activity/wait_event_names.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/backend/utils/activity/wait_event_names.txt b/src/backend/utils/activity/wait_event_names.txt
index 560659f9568..1016502d042 100644
--- a/src/backend/utils/activity/wait_event_names.txt
+++ b/src/backend/utils/activity/wait_event_names.txt
@@ -89,9 +89,6 @@ LIBPQWALRECEIVER_CONNECT	"Waiting in WAL receiver to establish connection to rem
 LIBPQWALRECEIVER_RECEIVE	"Waiting in WAL receiver to receive data from remote server."
 SSL_OPEN_SERVER	"Waiting for SSL while attempting connection."
 WAIT_FOR_STANDBY_CONFIRMATION	"Waiting for WAL to be received and flushed by the physical standby."
-WAIT_FOR_WAL_FLUSH	"Waiting for WAL flush to reach a target LSN on a primary or standby."
-WAIT_FOR_WAL_REPLAY	"Waiting for WAL replay to reach a target LSN on a standby."
-WAIT_FOR_WAL_WRITE	"Waiting for WAL write to reach a target LSN on a standby."
 WAL_SENDER_WAIT_FOR_WAL	"Waiting for WAL to be flushed in WAL sender process."
 WAL_SENDER_WRITE_DATA	"Waiting for any activity when processing replies from WAL receiver in WAL sender process."
 
@@ -162,6 +159,9 @@ REPLICATION_SLOT_DROP	"Waiting for a replication slot to become inactive so it c
 RESTORE_COMMAND	"Waiting for <xref linkend="guc-restore-command"/> to complete."
 SAFE_SNAPSHOT	"Waiting to obtain a valid snapshot for a <literal>READ ONLY DEFERRABLE</literal> transaction."
 SYNC_REP	"Waiting for confirmation from a remote server during synchronous replication."
+WAIT_FOR_WAL_FLUSH	"Waiting for WAL flush to reach a target LSN on a primary or standby."
+WAIT_FOR_WAL_REPLAY	"Waiting for WAL replay to reach a target LSN on a standby."
+WAIT_FOR_WAL_WRITE	"Waiting for WAL write to reach a target LSN on a standby."
 WAL_RECEIVER_EXIT	"Waiting for the WAL receiver to exit."
 WAL_RECEIVER_WAIT_START	"Waiting for startup process to send initial data for streaming replication."
 WAL_SUMMARY_READY	"Waiting for a new WAL summary to be generated."
-- 
2.50.1 (Apple Git-155)