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Remove the CheckpointStartLock in favor of having backends show whether they

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are in their commit critical sections via flags in the ProcArray.  Checkpoint
can watch the ProcArray to determine when it's safe to proceed.  This is
a considerably better solution to the original problem of race conditions
between checkpoint and transaction commit: it speeds up commit, since there's
one less lock to fool with, and it prevents the problem of checkpoint being
delayed indefinitely when there's a constant flow of commits.  Heikki, with
some kibitzing from Tom.
This commit is contained in:
Tom Lane
2007-04-03 16:34:36 +00:00
parent fb4279e99c
commit 9c9b619473
8 changed files with 182 additions and 53 deletions
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4
src/backend/storage/lmgr/proc.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.186 2007/03/07 13:35:03 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.187 2007/04/03 16:34:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -259,6 +259,7 @@ InitProcess(void)
/* databaseId and roleId will be filled in later */
MyProc->databaseId = InvalidOid;
MyProc->roleId = InvalidOid;
MyProc->inCommit = false;
MyProc->inVacuum = false;
MyProc->isAutovacuum = IsAutoVacuumWorkerProcess();
MyProc->lwWaiting = false;
@@ -392,6 +393,7 @@ InitAuxiliaryProcess(void)
MyProc->xmin = InvalidTransactionId;
MyProc->databaseId = InvalidOid;
MyProc->roleId = InvalidOid;
MyProc->inCommit = false;
MyProc->inVacuum = false;
MyProc->isAutovacuum = IsAutoVacuumLauncherProcess(); /* is this needed? */
MyProc->lwWaiting = false;