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This patch extracts page buffer pooling and the simple

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least-recently-used strategy from clog.c into slru.c.  It doesn't
change any visible behaviour and passes all regression tests plus a
TruncateCLOG test done manually.

Apart from refactoring I made a little change to SlruRecentlyUsed,
formerly ClogRecentlyUsed:  It now skips incrementing lru_counts, if
slotno is already the LRU slot, thus saving a few CPU cycles.  To make
this work, lru_counts are initialised to 1 in SimpleLruInit.

SimpleLru will be used by pg_subtrans (part of the nested transactions
project), so the main purpose of this patch is to avoid future code
duplication.

Manfred Koizar
This commit is contained in:
Bruce Momjian
2003-06-11 22:37:46 +00:00
parent 240dc5cddc
commit 0abe7431c6
6 changed files with 990 additions and 799 deletions
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6
src/backend/storage/lmgr/lwlock.c
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@@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lwlock.c,v 1.14 2002/09/25 20:31:40 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lwlock.c,v 1.15 2003/06/11 22:37:45 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -108,8 +108,8 @@ NumLWLocks(void)
/* bufmgr.c needs two for each shared buffer */
numLocks += 2 * NBuffers;
/* clog.c needs one per CLOG buffer */
numLocks += NUM_CLOG_BUFFERS;
/* clog.c needs one per CLOG buffer + one control lock */
numLocks += NUM_CLOG_BUFFERS + 1;
/* Perhaps create a few more for use by user-defined modules? */