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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2002-12-15 21:01:34 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2002-12-15 21:01:34 +0000 |
| commit | e64c7feb2fd80c89d2220cbe9e026a031f34509c (patch) | |
| tree | b7842bbf8efc3b7849b29c8a1b67a4a196f9ee2e /src/include/utils/memutils.h | |
| parent | 5bab36e9f6c3f3a9e14a89e1124179a339d2c3a1 (diff) | |
| download | postgresql-e64c7feb2fd80c89d2220cbe9e026a031f34509c.tar.gz postgresql-e64c7feb2fd80c89d2220cbe9e026a031f34509c.zip | |
Tweak default memory context allocation policy so that a context is not
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.
Diffstat (limited to 'src/include/utils/memutils.h')
| -rw-r--r-- | src/include/utils/memutils.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/include/utils/memutils.h b/src/include/utils/memutils.h index 8529f948227..94578b8fb6f 100644 --- a/src/include/utils/memutils.h +++ b/src/include/utils/memutils.h @@ -10,7 +10,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: memutils.h,v 1.48 2002/09/04 20:31:45 momjian Exp $ + * $Id: memutils.h,v 1.49 2002/12/15 21:01:34 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -116,8 +116,16 @@ extern MemoryContext AllocSetContextCreate(MemoryContext parent, * Recommended default alloc parameters, suitable for "ordinary" contexts * that might hold quite a lot of data. */ -#define ALLOCSET_DEFAULT_MINSIZE (8 * 1024) +#define ALLOCSET_DEFAULT_MINSIZE 0 #define ALLOCSET_DEFAULT_INITSIZE (8 * 1024) #define ALLOCSET_DEFAULT_MAXSIZE (8 * 1024 * 1024) +/* + * Recommended alloc parameters for "small" contexts that are not expected + * to contain much data (for example, a context to contain a query plan). + */ +#define ALLOCSET_SMALL_MINSIZE 0 +#define ALLOCSET_SMALL_INITSIZE (1 * 1024) +#define ALLOCSET_SMALL_MAXSIZE (8 * 1024) + #endif /* MEMUTILS_H */ |