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This patch extracts page buffer pooling and the simple
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
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src/backend/access/transam/Makefile

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