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Reimplement free-space-map management as per recent discussions.

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Adjustable threshold is gone in favor of keeping track of total requested
page storage and doling out proportional fractions to each relation
(with a minimum amount per relation, and some quantization of the results
to avoid thrashing with small changes in page counts).  Provide special-
case code for indexes so as not to waste space storing useless page
free space counts.  Restructure internal data storage to be a flat array
instead of list-of-chunks; this may cost a little more work in data
copying when reorganizing, but allows binary search to be used during
lookup_fsm_page_entry().
This commit is contained in:
Tom Lane
2003-03-04 21:51:22 +00:00
parent a455c94257
commit 391eb5e5b6
10 changed files with 1165 additions and 741 deletions
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22
src/include/storage/freespace.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: freespace.h,v 1.8 2002/09/20 19:56:01 tgl Exp $
* $Id: freespace.h,v 1.9 2003/03/04 21:51:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -28,6 +28,7 @@ typedef struct PageFreeSpaceInfo
} PageFreeSpaceInfo;
/* GUC variables */
extern int MaxFSMRelations;
extern int MaxFSMPages;
@@ -39,19 +40,26 @@ extern void InitFreeSpaceMap(void);
extern int FreeSpaceShmemSize(void);
extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded);
extern void RecordFreeSpace(RelFileNode *rel, BlockNumber page,
Size spaceAvail);
extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel,
BlockNumber oldPage,
Size oldSpaceAvail,
Size spaceNeeded);
extern void MultiRecordFreeSpace(RelFileNode *rel,
BlockNumber minPage,
int nPages,
PageFreeSpaceInfo *pageSpaces);
extern Size GetAvgFSMRequestSize(RelFileNode *rel);
extern void RecordRelationFreeSpace(RelFileNode *rel,
int nPages,
PageFreeSpaceInfo *pageSpaces);
extern BlockNumber GetFreeIndexPage(RelFileNode *rel);
extern void RecordIndexFreeSpace(RelFileNode *rel,
int nPages,
BlockNumber *pages);
extern void FreeSpaceMapTruncateRel(RelFileNode *rel, BlockNumber nblocks);
extern void FreeSpaceMapForgetRel(RelFileNode *rel);
extern void FreeSpaceMapForgetDatabase(Oid dbid);
extern void PrintFreeSpaceMapStatistics(int elevel);
#ifdef FREESPACE_DEBUG
extern void DumpFreeSpace(void);
#endif