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Rewrite the FSM. Instead of relying on a fixed-size shared memory segment, the

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free space information is stored in a dedicated FSM relation fork, with each
relation (except for hash indexes; they don't use FSM).

This eliminates the max_fsm_relations and max_fsm_pages GUC options; remove any
trace of them from the backend, initdb, and documentation.

Rewrite contrib/pg_freespacemap to match the new FSM implementation. Also
introduce a new variant of the get_raw_page(regclass, int4, int4) function in
contrib/pageinspect that let's you to return pages from any relation fork, and
a new fsm_page_contents() function to inspect the new FSM pages.
This commit is contained in:
Heikki Linnakangas
2008-09-30 10:52:14 +00:00
parent 2dbc0ca937
commit 15c121b3ed
53 changed files with 1844 additions and 2720 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/backend/access/gist/gist.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.151 2008/06/12 09:12:29 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gist.c,v 1.152 2008/09/30 10:52:10 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -19,6 +19,7 @@
#include "catalog/index.h"
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/indexfsm.h"
#include "utils/memutils.h"
const XLogRecPtr XLogRecPtrForTemp = {1, 1};
@ -102,6 +103,9 @@ gistbuild(PG_FUNCTION_ARGS)
elog(ERROR, "index \"%s\" already contains data",
RelationGetRelationName(index));
/* Initialize FSM */
InitIndexFreeSpaceMap(index);
/* no locking is needed */
initGISTstate(&buildstate.giststate, index);

5
src/backend/access/gist/gistutil.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistutil.c,v 1.30 2008/07/13 20:45:46 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistutil.c,v 1.31 2008/09/30 10:52:10 heikki Exp $
*-------------------------------------------------------------------------
*/
#include "postgres.h"
@ -16,6 +16,7 @@
#include "access/gist_private.h"
#include "access/reloptions.h"
#include "storage/freespace.h"
#include "storage/indexfsm.h"
#include "storage/lmgr.h"
#include "storage/bufmgr.h"
#include "utils/rel.h"
@ -617,7 +618,7 @@ gistNewBuffer(Relation r)
/* First, try to get a page from FSM */
for (;;)
{
BlockNumber blkno = GetFreeIndexPage(&r->rd_node);
BlockNumber blkno = GetFreeIndexPage(r);
if (blkno == InvalidBlockNumber)
break; /* nothing left in FSM */

37
src/backend/access/gist/gistvacuum.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.36 2008/06/12 09:12:30 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.37 2008/09/30 10:52:10 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -20,6 +20,7 @@
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/freespace.h"
#include "storage/indexfsm.h"
#include "storage/lmgr.h"
#include "utils/memutils.h"
@ -518,10 +519,7 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
Relation rel = info->index;
BlockNumber npages,
blkno;
BlockNumber totFreePages,
nFreePages,
*freePages,
maxFreePages;
BlockNumber totFreePages;
BlockNumber lastBlock = GIST_ROOT_BLKNO,
lastFilledBlock = GIST_ROOT_BLKNO;
bool needLock;
@ -589,13 +587,7 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
if (needLock)
UnlockRelationForExtension(rel, ExclusiveLock);
maxFreePages = npages;
if (maxFreePages > MaxFSMPages)
maxFreePages = MaxFSMPages;
totFreePages = nFreePages = 0;
freePages = (BlockNumber *) palloc(sizeof(BlockNumber) * maxFreePages);
totFreePages = 0;
for (blkno = GIST_ROOT_BLKNO + 1; blkno < npages; blkno++)
{
Buffer buffer;
@ -609,9 +601,8 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
if (PageIsNew(page) || GistPageIsDeleted(page))
{
if (nFreePages < maxFreePages)
freePages[nFreePages++] = blkno;
totFreePages++;
RecordFreeIndexPage(rel, blkno);
}
else
lastFilledBlock = blkno;
@ -619,25 +610,15 @@ gistvacuumcleanup(PG_FUNCTION_ARGS)
}
lastBlock = npages - 1;
if (info->vacuum_full && nFreePages > 0)
if (info->vacuum_full && lastFilledBlock < lastBlock)
{ /* try to truncate index */
int i;
FreeSpaceMapTruncateRel(rel, lastFilledBlock + 1);
RelationTruncate(rel, lastFilledBlock + 1);
for (i = 0; i < nFreePages; i++)
if (freePages[i] >= lastFilledBlock)
{
totFreePages = nFreePages = i;
break;
}
if (lastBlock > lastFilledBlock)
RelationTruncate(rel, lastFilledBlock + 1);
stats->std.pages_removed = lastBlock - lastFilledBlock;
totFreePages = totFreePages - stats->std.pages_removed;
}
RecordIndexFreeSpace(&rel->rd_node, totFreePages, nFreePages, freePages);
pfree(freePages);
/* return statistics */
stats->std.pages_free = totFreePages;
if (needLock)