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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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4
src/backend/access/transam/Makefile
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@@ -4,7 +4,7 @@
# Makefile for access/transam
#
# IDENTIFICATION
# $Header: /cvsroot/pgsql/src/backend/access/transam/Makefile,v 1.16 2003/05/12 23:08:50 tgl Exp $
# $Header: /cvsroot/pgsql/src/backend/access/transam/Makefile,v 1.17 2003/06/11 22:37:45 momjian Exp $
#
#-------------------------------------------------------------------------
@@ -12,7 +12,7 @@ subdir = src/backend/access/transam
top_builddir = ../../../..
include $(top_builddir)/src/Makefile.global
OBJS = clog.o transam.o varsup.o xact.o xlog.o xlogutils.o rmgr.o
OBJS = clog.o transam.o varsup.o xact.o xlog.o xlogutils.o rmgr.o slru.o
all: SUBSYS.o