From edc25ff76b77244880120803ca0f495fa734a02c Mon Sep 17 00:00:00 2001 From: Heikki Linnakangas Date: Tue, 31 Mar 2026 18:39:03 +0300 Subject: [PATCH v3 3/4] Make the lock hash tables fixed-sized --- src/backend/storage/lmgr/lock.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c index 2159de9015a..ac7c5ed0604 100644 --- a/src/backend/storage/lmgr/lock.c +++ b/src/backend/storage/lmgr/lock.c @@ -445,16 +445,14 @@ void LockManagerShmemInit(void) { HASHCTL info; - int64 init_table_size, - max_table_size; + int64 max_table_size; bool found; /* - * Compute init/max size to request for lock hashtables. Note these - * calculations must agree with LockManagerShmemSize! + * Compute sizes for lock hashtables. Note that these calculations must + * agree with LockManagerShmemSize! */ max_table_size = NLOCKENTS(); - init_table_size = max_table_size / 2; /* * Allocate hash table for LOCK structs. This stores per-locked-object @@ -465,14 +463,14 @@ LockManagerShmemInit(void) info.num_partitions = NUM_LOCK_PARTITIONS; LockMethodLockHash = ShmemInitHash("LOCK hash", - init_table_size, + max_table_size, max_table_size, &info, - HASH_ELEM | HASH_BLOBS | HASH_PARTITION); + HASH_ELEM | HASH_BLOBS | + HASH_PARTITION | HASH_FIXED_SIZE); /* Assume an average of 2 holders per lock */ max_table_size *= 2; - init_table_size *= 2; /* * Allocate hash table for PROCLOCK structs. This stores @@ -484,10 +482,11 @@ LockManagerShmemInit(void) info.num_partitions = NUM_LOCK_PARTITIONS; LockMethodProcLockHash = ShmemInitHash("PROCLOCK hash", - init_table_size, + max_table_size, max_table_size, &info, - HASH_ELEM | HASH_FUNCTION | HASH_PARTITION); + HASH_ELEM | HASH_FUNCTION | + HASH_FIXED_SIZE | HASH_PARTITION); /* * Allocate fast-path structures. -- 2.47.3