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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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12
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.86 2002/12/15 16:17:56 tgl Exp $
* $Id: execnodes.h,v 1.87 2002/12/15 21:01:34 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -218,16 +218,7 @@ typedef struct ProjectionInfo
* cleanMap: A map with the correspondence between the non-junk
* attribute numbers of the "original" tuple and the
* attribute numbers of the "clean" tuple.
* junkContext: memory context holding the JunkFilter node and all
* its subsidiary data structures.
* resultSlot: tuple slot that can be used to hold cleaned tuple.
*
* NOTE: the original targetList and tupType are passed to ExecInitJunkFilter,
* as is the resultSlot. These items do not belong to the JunkFilter. All
* the other subsidiary structures are created during ExecInitJunkFilter,
* and all of them can be freed by deleting the memory context junkContext.
* This would not be needed if we had a cleaner approach to managing
* query-lifetime data structures...
* ----------------
*/
typedef struct JunkFilter
@ -240,7 +231,6 @@ typedef struct JunkFilter
int jf_cleanLength;
TupleDesc jf_cleanTupType;
AttrNumber *jf_cleanMap;
MemoryContext jf_junkContext;
TupleTableSlot *jf_resultSlot;
} JunkFilter;