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Give the ResourceOwner mechanism full responsibility for releasing buffer

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pins at end of transaction, and reduce AtEOXact_Buffers to an Assert
cross-check that this was done correctly.  When not USE_ASSERT_CHECKING,
AtEOXact_Buffers is a complete no-op.  This gets rid of an O(NBuffers)
bottleneck during transaction commit/abort, which recent testing has shown
becomes significant above a few tens of thousands of shared buffers.
This commit is contained in:
Tom Lane
2004-10-16 18:57:26 +00:00
parent 1c2de47746
commit fdd13f1568
6 changed files with 95 additions and 72 deletions
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4
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.87 2004/10/15 22:40:25 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.88 2004/10/16 18:57:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -122,6 +122,8 @@ extern void InitBufferPoolAccess(void);
extern char *ShowBufferUsage(void);
extern void ResetBufferUsage(void);
extern void AtEOXact_Buffers(bool isCommit);
extern void AtProcExit_Buffers(void);
extern void PrintBufferLeakWarning(Buffer buffer);
extern void FlushBufferPool(void);
extern BlockNumber BufferGetBlockNumber(Buffer buffer);
extern BlockNumber RelationGetNumberOfBlocks(Relation relation);