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author Nathan Bossart <nathan@postgresql.org>

2025年8月19日 21:48:22 +0000 (16:48 -0500)

committer Nathan Bossart <nathan@postgresql.org>

2025年8月19日 21:48:22 +0000 (16:48 -0500)

This comment mentions that pg_buffercache locks all buffer
partitions simultaneously, but it hasn't done so since v10.

Oversight in commit 6e654546fb.

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/aKTuAHVEuYCUmmIy%40nathan

src/backend/storage/lmgr/lwlock.c patch | blob | blame | history

diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c

index ec9c345ffdfb88c825fb4a7c63dbd165d6af0e47..c80b43f1f55cf565eb1dfd996ae96e48b584ac33 100644 (file)

--- a/src/backend/storage/lmgr/lwlock.c

+++ b/src/backend/storage/lmgr/lwlock.c

@@ -162,8 +162,7 @@ LWLockPadded *MainLWLockArray = NULL;

* We use this structure to keep track of locked LWLocks for release

* during error recovery. Normally, only a few will be held at once, but

- * occasionally the number can be much higher; for example, the pg_buffercache

- * extension locks all buffer partitions simultaneously.

+ * occasionally the number can be much higher.

#define MAX_SIMUL_LWLOCKS 200

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