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Tweak default memory context allocation policy so that a context is not

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given any malloc block until something is first allocated in it; but
thereafter, MemoryContextReset won't release that first malloc block.
This preserves the quick-reset property of the original policy, without
forcing 8K to be allocated to every context whether any of it is ever
used or not.  Also, remove some more no-longer-needed explicit freeing
during ExecEndPlan.
This commit is contained in:
Tom Lane
2002-12-15 21:01:34 +00:00
parent 5bab36e9f6
commit e64c7feb2f
11 changed files with 66 additions and 99 deletions
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13
src/backend/commands/trigger.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/trigger.c,v 1.141 2002/11/25 03:36:50 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/trigger.c,v 1.142 2002/12/15 21:01:34 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -2008,13 +2008,9 @@ deferredTriggerInvokeEvents(bool immediate_only)
void
DeferredTriggerInit(void)
{
/*
* Since this context will never be reset, give it a minsize of 0.
* This avoids using any memory if the session never stores anything.
*/
deftrig_gcxt = AllocSetContextCreate(TopMemoryContext,
"DeferredTriggerSession",
0,
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
}
@@ -2041,12 +2037,11 @@ DeferredTriggerBeginXact(void)
/*
* Create the per transaction memory context and copy all states from
* the per session context to here. Set the minsize to 0 to avoid
* wasting memory if there is no deferred trigger data.
* the per session context to here.
*/
deftrig_cxt = AllocSetContextCreate(TopTransactionContext,
"DeferredTriggerXact",
0,
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
oldcxt = MemoryContextSwitchTo(deftrig_cxt);