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Message-ID: <43EB4FD5.20107@yahoo.com.au>
Date: Fri, 10 Feb 2006 01:21:09 +1100
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Con Kolivas <kernel@kolivas.org>
CC: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
       ck list <ck@vds.kolivas.org>, linux-mm@kvack.org,
       Paul Jackson <pj@sgi.com>
Subject: Re: [PATCH] mm: Implement Swap Prefetching v22
References: <200602092339.49719.kernel@kolivas.org> <43EB43B9.5040001@yahoo.com.au> <200602100047.09722.kernel@kolivas.org>
In-Reply-To: <200602100047.09722.kernel@kolivas.org>
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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)

-- 
SUSE Labs, Novell Inc.
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