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Commitbc7cb8f

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committed
Allocate local buffers in a context of their own, rather than dumping them
into TopMemoryContext. This makes no functional difference, but makes iteasier to see what the space is being used for in MemoryContextStats dumps.Per a recent example in which I was surprised by the size of TopMemoryContext.
1 parente275d16 commitbc7cb8f

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1 file changed

+16
-3
lines changed

1 file changed

+16
-3
lines changed

‎src/backend/storage/buffer/localbuf.c‎

Lines changed: 16 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
*
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*
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* IDENTIFICATION
12-
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.90 2010/08/13 20:10:52 rhaas Exp $
12+
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.91 2010/08/19 16:16:20 tgl Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -399,6 +399,7 @@ GetLocalBufferStorage(void)
399399
staticintnext_buf_in_block=0;
400400
staticintnum_bufs_in_block=0;
401401
staticinttotal_bufs_allocated=0;
402+
staticMemoryContextLocalBufferContext=NULL;
402403

403404
char*this_buf;
404405

@@ -409,15 +410,27 @@ GetLocalBufferStorage(void)
409410
/* Need to make a new request to memmgr */
410411
intnum_bufs;
411412

413+
/*
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* We allocate local buffers in a context of their own, so that the
415+
* space eaten for them is easily recognizable in MemoryContextStats
416+
* output. Create the context on first use.
417+
*/
418+
if (LocalBufferContext==NULL)
419+
LocalBufferContext=
420+
AllocSetContextCreate(TopMemoryContext,
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"LocalBufferContext",
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ALLOCSET_DEFAULT_MINSIZE,
423+
ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
425+
412426
/* Start with a 16-buffer request; subsequent ones double each time */
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num_bufs=Max(num_bufs_in_block*2,16);
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/* But not more than what we need for all remaining local bufs */
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num_bufs=Min(num_bufs,NLocBuffer-total_bufs_allocated);
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/* And don't overflow MaxAllocSize, either */
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num_bufs=Min(num_bufs,MaxAllocSize /BLCKSZ);
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419-
/* Allocate space from TopMemoryContext so it never goes away */
420-
cur_block= (char*)MemoryContextAlloc(TopMemoryContext,
433+
cur_block= (char*)MemoryContextAlloc(LocalBufferContext,
421434
num_bufs*BLCKSZ);
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next_buf_in_block=0;
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num_bufs_in_block=num_bufs;

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