From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Sat, 4 Apr 2026 08:46:11 +0000 (+0300)
Subject: Add missing shmem size estimate for fast-path locking struct
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=c06443063f01b0996a16dea77462ac6b31eb181d;p=thirdparty%2Fpostgresql.git

Add missing shmem size estimate for fast-path locking struct

It's been missing ever since fast-path locking was introduced. It's a
small discrepancy, about 4 kB, but let's be tidy. This doesn't seem
worth backpatching, however; in stable branches we were less precise
about the estimates and e.g. added a 10% margin to the hash table
estimates, which is usually much bigger than this discrepancy.
---

diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 9dae407981f..798c453ab38 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -3775,6 +3775,9 @@ LockManagerShmemSize(void)
 	max_table_size *= 2;
 	size = add_size(size, hash_estimate_size(max_table_size, sizeof(PROCLOCK)));
 
+	/* fast-path structures */
+	size = add_size(size, sizeof(FastPathStrongRelationLockData));
+
 	return size;
 }