From fbce7dfc77eaa0d017dfee78c9d27b142d435e41 Mon Sep 17 00:00:00 2001 From: Heikki Linnakangas Date: Thu, 29 Aug 2024 09:46:06 +0300 Subject: [PATCH] Refactor lock manager initialization to make it a bit less special Split the shared and local initialization to separate functions, and follow the common naming conventions. With this, we no longer create the LockMethodLocalHash hash table in the postmaster process, which was always pointless. Reviewed-by: Andreas Karlsson Discussion: https://www.postgresql.org/message-id/c09694ff-2453-47e5-b26c-32a16cd75ce6@iki.fi --- src/backend/storage/ipc/ipci.c | 4 ++-- src/backend/storage/lmgr/lock.c | 35 +++++++++++++++---------------- src/backend/utils/init/postinit.c | 3 +++ src/include/storage/lock.h | 5 +++-- 4 files changed, 25 insertions(+), 22 deletions(-) diff --git a/src/backend/storage/ipc/ipci.c b/src/backend/storage/ipc/ipci.c index 35fa2e1dda6..8f8a89124e8 100644 --- a/src/backend/storage/ipc/ipci.c +++ b/src/backend/storage/ipc/ipci.c @@ -116,7 +116,7 @@ CalculateShmemSize(int *num_semaphores) size = add_size(size, dsm_estimate_size()); size = add_size(size, DSMRegistryShmemSize()); size = add_size(size, BufferShmemSize()); - size = add_size(size, LockShmemSize()); + size = add_size(size, LockManagerShmemSize()); size = add_size(size, PredicateLockShmemSize()); size = add_size(size, ProcGlobalShmemSize()); size = add_size(size, XLogPrefetchShmemSize()); @@ -291,7 +291,7 @@ CreateOrAttachShmemStructs(void) /* * Set up lock manager */ - InitLocks(); + LockManagerShmemInit(); /* * Set up predicate lock manager diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c index 0400a507779..6dbc41dae70 100644 --- a/src/backend/storage/lmgr/lock.c +++ b/src/backend/storage/lmgr/lock.c @@ -377,19 +377,17 @@ static void GetSingleProcBlockerStatusData(PGPROC *blocked_proc, /* - * InitLocks -- Initialize the lock manager's data structures. + * Initialize the lock manager's shmem data structures. * - * This is called from CreateSharedMemoryAndSemaphores(), which see for - * more comments. In the normal postmaster case, the shared hash tables - * are created here, as well as a locallock hash table that will remain - * unused and empty in the postmaster itself. Backends inherit the pointers - * to the shared tables via fork(), and also inherit an image of the locallock - * hash table, which they proceed to use. In the EXEC_BACKEND case, each - * backend re-executes this code to obtain pointers to the already existing - * shared hash tables and to create its locallock hash table. + * This is called from CreateSharedMemoryAndSemaphores(), which see for more + * comments. In the normal postmaster case, the shared hash tables are + * created here, and backends inherit pointers to them via fork(). In the + * EXEC_BACKEND case, each backend re-executes this code to obtain pointers to + * the already existing shared hash tables. In either case, each backend must + * also call InitLockManagerAccess() to create the locallock hash table. */ void -InitLocks(void) +LockManagerShmemInit(void) { HASHCTL info; long init_table_size, @@ -444,18 +442,19 @@ InitLocks(void) sizeof(FastPathStrongRelationLockData), &found); if (!found) SpinLockInit(&FastPathStrongRelationLocks->mutex); +} +/* + * Initialize the lock manager's backend-private data structures. + */ +void +InitLockManagerAccess(void) +{ /* * Allocate non-shared hash table for LOCALLOCK structs. This stores lock * counts and resource owner information. - * - * The non-shared table could already exist in this process (this occurs - * when the postmaster is recreating shared memory after a backend crash). - * If so, delete and recreate it. (We could simply leave it, since it - * ought to be empty in the postmaster, but for safety let's zap it.) */ - if (LockMethodLocalHash) - hash_destroy(LockMethodLocalHash); + HASHCTL info; info.keysize = sizeof(LOCALLOCKTAG); info.entrysize = sizeof(LOCALLOCK); @@ -3571,7 +3570,7 @@ PostPrepare_Locks(TransactionId xid) * Estimate shared-memory space used for lock tables */ Size -LockShmemSize(void) +LockManagerShmemSize(void) { Size size = 0; long max_table_size; diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c index 13524ea488a..04a47d6e704 100644 --- a/src/backend/utils/init/postinit.c +++ b/src/backend/utils/init/postinit.c @@ -606,6 +606,9 @@ BaseInit(void) */ InitXLogInsert(); + /* Initialize lock manager's local structs */ + InitLockManagerAccess(); + /* * Initialize replication slots after pgstat. The exit hook might need to * drop ephemeral slots, which in turn triggers stats reporting. diff --git a/src/include/storage/lock.h b/src/include/storage/lock.h index cc1f6e78c39..8b328a06d9e 100644 --- a/src/include/storage/lock.h +++ b/src/include/storage/lock.h @@ -544,7 +544,9 @@ typedef enum /* * function prototypes */ -extern void InitLocks(void); +extern void LockManagerShmemInit(void); +extern Size LockManagerShmemSize(void); +extern void InitLockManagerAccess(void); extern LockMethod GetLocksMethodTable(const LOCK *lock); extern LockMethod GetLockTagsMethodTable(const LOCKTAG *locktag); extern uint32 LockTagHashCode(const LOCKTAG *locktag); @@ -584,7 +586,6 @@ extern bool LockCheckConflicts(LockMethod lockMethodTable, extern void GrantLock(LOCK *lock, PROCLOCK *proclock, LOCKMODE lockmode); extern void GrantAwaitedLock(void); extern void RemoveFromWaitQueue(PGPROC *proc, uint32 hashcode); -extern Size LockShmemSize(void); extern LockData *GetLockStatusData(void); extern BlockedProcsData *GetBlockerStatusData(int blocked_pid);