Re: [PATCH] mm: Implement Swap Prefetching v22

[Nick Piggin]

Con Kolivas wrote:

> I really don't want to go throwing out pagecache without some smart semantics 
> and then swap in random stuff that could be crap I agree. The answer to this 
> is for the vm itself to have an ageing algorithm like the clockpro stuff 
> which does this in a smart way. It could certainly age away the updatedb 
> wrinkles and leave some free ram - which would help/be helped by prefetching.

AFAIK clockpro will not leave free ram, will it?

Getting a little hand-wavy; I don't think the updatedb problem needs to
be fixed by a really fancy page reclaim algorithm (IMO, and that's not to
say that a fancy reclaim algorithm wouldn't be nice for other reasons).
Just small improvements here and there, and there will always be a tradeoff
between throughput and interactive pagein latency so in the end it might
need a tunable (hey there is one - maybe it needs to be improved)

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SUSE Labs, Novell Inc.
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