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Micro-optimization of markpos() and restrpos() in btree and hash indexes.

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Rather than using ReadBuffer() to increment the reference count on an
already-pinned buffer, we should use IncrBufferRefCount() as it is
faster and does not require acquiring the BufMgrLock.
This commit is contained in:
Neil Conway
2004-11-17 03:13:38 +00:00
parent a51e54cf5b
commit 5d1dd2bc55
2 changed files with 10 additions and 12 deletions
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12
src/backend/access/hash/hash.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.74 2004/11/11 00:32:40 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.75 2004/11/17 03:13:37 neilc Exp $
*
* NOTES
* This file contains only the public interface routines.
@@ -397,9 +397,8 @@ hashmarkpos(PG_FUNCTION_ARGS)
/* bump pin count on currentItemData and copy to currentMarkData */
if (ItemPointerIsValid(&(scan->currentItemData)))
{
so->hashso_mrkbuf = _hash_getbuf(rel,
BufferGetBlockNumber(so->hashso_curbuf),
HASH_NOLOCK);
IncrBufferRefCount(so->hashso_curbuf);
so->hashso_mrkbuf = so->hashso_curbuf;
scan->currentMarkData = scan->currentItemData;
}
@@ -425,9 +424,8 @@ hashrestrpos(PG_FUNCTION_ARGS)
/* bump pin count on currentMarkData and copy to currentItemData */
if (ItemPointerIsValid(&(scan->currentMarkData)))
{
so->hashso_curbuf = _hash_getbuf(rel,
BufferGetBlockNumber(so->hashso_mrkbuf),
HASH_NOLOCK);
IncrBufferRefCount(so->hashso_mrkbuf);
so->hashso_curbuf = so->hashso_mrkbuf;
scan->currentItemData = scan->currentMarkData;
}