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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
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6
src/backend/access/heap/heapam.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.263 2008/09/11 14:01:09 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.264 2008/09/30 10:52:10 heikki Exp $
*
*
* INTERFACE ROUTINES
@ -4721,6 +4721,9 @@ heap_sync(Relation rel)
/* FlushRelationBuffers will have opened rd_smgr */
smgrimmedsync(rel->rd_smgr, MAIN_FORKNUM);
/* sync FSM as well */
smgrimmedsync(rel->rd_smgr, FSM_FORKNUM);
/* toast heap, if any */
if (OidIsValid(rel->rd_rel->reltoastrelid))
{
@ -4729,6 +4732,7 @@ heap_sync(Relation rel)
toastrel = heap_open(rel->rd_rel->reltoastrelid, AccessShareLock);
FlushRelationBuffers(toastrel);
smgrimmedsync(toastrel->rd_smgr, MAIN_FORKNUM);
smgrimmedsync(toastrel->rd_smgr, FSM_FORKNUM);
heap_close(toastrel, AccessShareLock);
}
}

7
src/backend/access/heap/hio.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.72 2008/07/13 20:45:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.73 2008/09/30 10:52:10 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -163,8 +163,7 @@ RelationGetBufferForTuple(Relation relation, Size len,
* We have no cached target page, so ask the FSM for an initial
* target.
*/
targetBlock = GetPageWithFreeSpace(&relation->rd_node,
len + saveFreeSpace);
targetBlock = GetPageWithFreeSpace(relation, len + saveFreeSpace);
/*
* If the FSM knows nothing of the rel, try the last page before we
@ -250,7 +249,7 @@ RelationGetBufferForTuple(Relation relation, Size len,
* Update FSM as to condition of this page, and ask for another page
* to try.
*/
targetBlock = RecordAndGetPageWithFreeSpace(&relation->rd_node,
targetBlock = RecordAndGetPageWithFreeSpace(relation,
targetBlock,
pageFreeSpace,
len + saveFreeSpace);