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