linux-kernel - Re: [ck] Re: -mm merge plans for 2.6.23

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Message-ID: <469470A3.5040606@yahoo.com.au>
Date:	Wed, 11 Jul 2007 15:54:43 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ray Lee <ray-lk@...rabbit.org>
CC:	Matthew Hawkins <darthmdh@...il.com>,
	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

Ray Lee wrote:
> On 7/10/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> 
>> 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.
> 
> 
> Eviction can happen for multiple reasons, as I'm sure you're painfully
> aware. It can happen because of poor balancing choices, or it can

s/balancing/reclaim, yes. And for the nightly cron job case, this is
could quite possibly be the cause. At least updatedb should be fairly
easy to apply use-once heuristics for, so if they're not working then
we should hopefully be able to improve it.

-- 
SUSE Labs, Novell Inc.
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