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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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10
src/backend/storage/lmgr/proc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.154 2004/09/29 15:15:55 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.155 2004/10/16 18:57:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -461,9 +461,7 @@ ProcKill(int code, Datum arg)
* shutdown callback registered by the bufmgr ... but we must do this
* *after* LWLockReleaseAll and *before* zapping MyProc.
*/
AbortBufferIO();
UnlockBuffers();
AtEOXact_Buffers(false);
AtProcExit_Buffers();
/* Get off any wait queue I might be on */
LockWaitCancel();
@ -509,9 +507,7 @@ DummyProcKill(int code, Datum arg)
LWLockReleaseAll();
/* Release buffer locks and pins, too */
AbortBufferIO();
UnlockBuffers();
AtEOXact_Buffers(false);
AtProcExit_Buffers();
/* I can't be on regular lock queues, so needn't check */