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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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10
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.556 2008/08/19 18:30:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.557 2008/09/30 10:52:13 heikki Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -57,7 +57,6 @@
#include "postmaster/autovacuum.h"
#include "rewrite/rewriteHandler.h"
#include "storage/bufmgr.h"
#include "storage/freespace.h"
#include "storage/ipc.h"
#include "storage/proc.h"
#include "storage/sinval.h"
@ -3258,13 +3257,6 @@ PostgresMain(int argc, char *argv[], const char *username)
StartupXLOG();
on_shmem_exit(ShutdownXLOG, 0);
/*
* Read any existing FSM cache file, and register to write one out at
* exit.
*/
LoadFreeSpaceMap();
on_shmem_exit(DumpFreeSpaceMap, 0);
/*
* We have to build the flat file for pg_database, but not for the
* user and group tables, since we won't try to do authentication.