Re: Simple LRU for clog and (later) subtrans

(Applying newer version, but posting this because it has a description.)

Your patch has been added to the PostgreSQL unapplied patches list at:

	http://momjian.postgresql.org/cgi-bin/pgpatches

I will try to apply it within the next 48 hours.

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Manfred Koizar wrote:
> 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.

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