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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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1728
src/backend/storage/freespace/freespace.c
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4
src/backend/storage/smgr/smgr.c
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.61 2002/09/20 19:56:01 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.62 2003/03/04 21:51:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -410,7 +410,7 @@ smgrtruncate(int16 which, Relation reln, BlockNumber nblocks)
* for the about-to-be-deleted blocks. We want to be sure it
* won't return bogus block numbers later on.
*/
MultiRecordFreeSpace(&reln->rd_node, nblocks, 0, NULL);
FreeSpaceMapTruncateRel(&reln->rd_node, nblocks);
newblks = (*(smgrsw[which].smgr_truncate)) (reln, nblocks);
if (newblks == InvalidBlockNumber)