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Arrange to cache btree metapage data in the relcache entry for the index,

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thereby saving a visit to the metapage in most index searches/updates.
This wouldn't actually save any I/O (since in the old regime the metapage
generally stayed in cache anyway), but it does provide a useful decrease
in bufmgr traffic in high-contention scenarios.  Per my recent proposal.
This commit is contained in:
Tom Lane
2006-04-25 22:46:05 +00:00
parent 89083876c9
commit d2896a9ed1
6 changed files with 122 additions and 9 deletions
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11
src/backend/access/nbtree/nbtinsert.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.135 2006/04/13 03:53:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.136 2006/04/25 22:46:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,6 +18,7 @@
#include "access/heapam.h"
#include "access/nbtree.h"
#include "miscadmin.h"
#include "utils/inval.h"
typedef struct
@@ -638,9 +639,12 @@ _bt_insertonpg(Relation rel,
END_CRIT_SECTION();
/* release pin/lock */
/* release buffers; send out relcache inval if metapage changed */
if (BufferIsValid(metabuf))
{
CacheInvalidateRelcache(rel);
_bt_relbuf(rel, metabuf);
}
_bt_relbuf(rel, buf);
}
@@ -1526,6 +1530,9 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)
END_CRIT_SECTION();
/* send out relcache inval for metapage change */
CacheInvalidateRelcache(rel);
/* done with metapage */
_bt_relbuf(rel, metabuf);