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Commit5d1dd2b

Browse files
author
Neil Conway
committed
Micro-optimization of markpos() and restrpos() in btree and hash indexes.
Rather than using ReadBuffer() to increment the reference count on analready-pinned buffer, we should use IncrBufferRefCount() as it isfaster and does not require acquiring the BufMgrLock.
1 parenta51e54c commit5d1dd2b

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2 files changed

+10
-12
lines changed

2 files changed

+10
-12
lines changed

‎src/backend/access/hash/hash.c‎

Lines changed: 5 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.74 2004/11/11 00:32:40 neilc Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.75 2004/11/17 03:13:37 neilc Exp $
1212
*
1313
* NOTES
1414
* This file contains only the public interface routines.
@@ -397,9 +397,8 @@ hashmarkpos(PG_FUNCTION_ARGS)
397397
/* bump pin count on currentItemData and copy to currentMarkData */
398398
if (ItemPointerIsValid(&(scan->currentItemData)))
399399
{
400-
so->hashso_mrkbuf=_hash_getbuf(rel,
401-
BufferGetBlockNumber(so->hashso_curbuf),
402-
HASH_NOLOCK);
400+
IncrBufferRefCount(so->hashso_curbuf);
401+
so->hashso_mrkbuf=so->hashso_curbuf;
403402
scan->currentMarkData=scan->currentItemData;
404403
}
405404

@@ -425,9 +424,8 @@ hashrestrpos(PG_FUNCTION_ARGS)
425424
/* bump pin count on currentMarkData and copy to currentItemData */
426425
if (ItemPointerIsValid(&(scan->currentMarkData)))
427426
{
428-
so->hashso_curbuf=_hash_getbuf(rel,
429-
BufferGetBlockNumber(so->hashso_mrkbuf),
430-
HASH_NOLOCK);
427+
IncrBufferRefCount(so->hashso_mrkbuf);
428+
so->hashso_curbuf=so->hashso_mrkbuf;
431429
scan->currentItemData=scan->currentMarkData;
432430
}
433431

‎src/backend/access/nbtree/nbtree.c‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -12,7 +12,7 @@
1212
* Portions Copyright (c) 1994, Regents of the University of California
1313
*
1414
* IDENTIFICATION
15-
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.121 2004/11/11 00:32:50 neilc Exp $
15+
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.122 2004/11/17 03:13:38 neilc Exp $
1616
*
1717
*-------------------------------------------------------------------------
1818
*/
@@ -477,8 +477,8 @@ btmarkpos(PG_FUNCTION_ARGS)
477477
/* bump pin on current buffer for assignment to mark buffer */
478478
if (ItemPointerIsValid(&(scan->currentItemData)))
479479
{
480-
so->btso_mrkbuf=ReadBuffer(scan->indexRelation,
481-
BufferGetBlockNumber(so->btso_curbuf));
480+
IncrBufferRefCount(so->btso_curbuf);
481+
so->btso_mrkbuf=so->btso_curbuf;
482482
scan->currentMarkData=scan->currentItemData;
483483
so->mrkHeapIptr=so->curHeapIptr;
484484
}
@@ -509,8 +509,8 @@ btrestrpos(PG_FUNCTION_ARGS)
509509
/* bump pin on marked buffer */
510510
if (ItemPointerIsValid(&(scan->currentMarkData)))
511511
{
512-
so->btso_curbuf=ReadBuffer(scan->indexRelation,
513-
BufferGetBlockNumber(so->btso_mrkbuf));
512+
IncrBufferRefCount(so->btso_mrkbuf);
513+
so->btso_curbuf=so->btso_mrkbuf;
514514
scan->currentItemData=scan->currentMarkData;
515515
so->curHeapIptr=so->mrkHeapIptr;
516516
}

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