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bc22dc0e0d
Allow multiple backends to initialize WAL buffers concurrently. This way `MemSet((char *) NewPage, 0, XLOG_BLCKSZ);` can run in parallel without taking a single LWLock in exclusive mode. The new algorithm works as follows: * reserve a page for initialization using XLogCtl->InitializeReserved, * ensure the page is written out, * once the page is initialized, try to advance XLogCtl->InitializedUpTo and signal to waiters using XLogCtl->InitializedUpToCondVar condition variable, * repeat previous steps until we reserve initialization up to the target WAL position, * wait until concurrent initialization finishes using a XLogCtl->InitializedUpToCondVar. Now, multiple backends can, in parallel, concurrently reserve pages, initialize them, and advance XLogCtl->InitializedUpTo to point to the latest initialized page. Author: Yura Sokolov <y.sokolov@postgrespro.ru> Co-authored-by: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Tested-by: Michael Paquier <michael@paquier.xyz>
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* lwlocklist.h
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*
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* The predefined LWLock list is kept in its own source file for use by
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* automatic tools. The exact representation of a keyword is determined by
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* the PG_LWLOCK macro, which is not defined in this file; it can be
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* defined by the caller for special purposes.
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*
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* Also, generate-lwlocknames.pl processes this file to create lwlocknames.h.
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*
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* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/storage/lwlocklist.h
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*
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*-------------------------------------------------------------------------
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*/
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/*
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* Some commonly-used locks have predefined positions within MainLWLockArray;
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* these are defined here. If you add a lock, add it to the end to avoid
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* renumbering the existing locks; if you remove a lock, consider leaving a gap
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* in the numbering sequence for the benefit of DTrace and other external
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* debugging scripts. Also, do not forget to update the section
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* WaitEventLWLock of src/backend/utils/activity/wait_event_names.txt.
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*
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* Note that the names here don't include the Lock suffix, to appease the
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* C preprocessor; it's added elsewhere.
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*/
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/* 0 is available; was formerly BufFreelistLock */
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PG_LWLOCK(1, ShmemIndex)
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PG_LWLOCK(2, OidGen)
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PG_LWLOCK(3, XidGen)
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PG_LWLOCK(4, ProcArray)
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PG_LWLOCK(5, SInvalRead)
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PG_LWLOCK(6, SInvalWrite)
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/* 7 was WALBufMapping */
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PG_LWLOCK(8, WALWrite)
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PG_LWLOCK(9, ControlFile)
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/* 10 was CheckpointLock */
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/* 11 was XactSLRULock */
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/* 12 was SubtransSLRULock */
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PG_LWLOCK(13, MultiXactGen)
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/* 14 was MultiXactOffsetSLRULock */
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/* 15 was MultiXactMemberSLRULock */
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PG_LWLOCK(16, RelCacheInit)
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PG_LWLOCK(17, CheckpointerComm)
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PG_LWLOCK(18, TwoPhaseState)
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PG_LWLOCK(19, TablespaceCreate)
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PG_LWLOCK(20, BtreeVacuum)
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PG_LWLOCK(21, AddinShmemInit)
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PG_LWLOCK(22, Autovacuum)
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PG_LWLOCK(23, AutovacuumSchedule)
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PG_LWLOCK(24, SyncScan)
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PG_LWLOCK(25, RelationMapping)
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/* 26 was NotifySLRULock */
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PG_LWLOCK(27, NotifyQueue)
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PG_LWLOCK(28, SerializableXactHash)
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PG_LWLOCK(29, SerializableFinishedList)
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PG_LWLOCK(30, SerializablePredicateList)
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/* 31 was SerialSLRULock */
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PG_LWLOCK(32, SyncRep)
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PG_LWLOCK(33, BackgroundWorker)
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PG_LWLOCK(34, DynamicSharedMemoryControl)
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PG_LWLOCK(35, AutoFile)
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PG_LWLOCK(36, ReplicationSlotAllocation)
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PG_LWLOCK(37, ReplicationSlotControl)
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/* 38 was CommitTsSLRULock */
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PG_LWLOCK(39, CommitTs)
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PG_LWLOCK(40, ReplicationOrigin)
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PG_LWLOCK(41, MultiXactTruncation)
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/* 42 was OldSnapshotTimeMapLock */
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PG_LWLOCK(43, LogicalRepWorker)
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PG_LWLOCK(44, XactTruncation)
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/* 45 was XactTruncationLock until removal of BackendRandomLock */
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PG_LWLOCK(46, WrapLimitsVacuum)
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PG_LWLOCK(47, NotifyQueueTail)
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PG_LWLOCK(48, WaitEventCustom)
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PG_LWLOCK(49, WALSummarizer)
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PG_LWLOCK(50, DSMRegistry)
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PG_LWLOCK(51, InjectionPoint)
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PG_LWLOCK(52, SerialControl)
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PG_LWLOCK(53, AioWorkerSubmissionQueue)
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