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Message-ID: <4694683B.3060705@yahoo.com.au> Date: Wed, 11 Jul 2007 15:18:51 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Matthew Hawkins <darthmdh@...il.com> CC: Andrew Morton <akpm@...ux-foundation.org>, Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>, Paul Jackson <pj@....com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [ck] Re: -mm merge plans for 2.6.23 Matthew Hawkins wrote: > On 7/11/07, Andrew Morton <akpm@...ux-foundation.org> wrote: > Anyhow with swap prefetch, applications that may have been sitting > there idle for a while become responsive in the single-digit seconds > rather than double-digit or worse. The same goes for a morning wakeup > (ie after nightly cron jobs throw things out) OK that's a good data point. It would be really good to be able to do an analysis on your overnight IO patterns and the corresponding memory reclaim behaviour and see why things are getting evicted. Not that swap prefetching isn't a good solution for this situation, but the fact that things are getting swapped out for you also means that mapped files and possibly important pagecache and dentries are being flushed out, which we might be able to avoid. Thanks, Nick -- SUSE Labs, Novell Inc. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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