linux-kernel - Re: -mm merge plans for 2.6.23

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Date:	Wed, 25 Jul 2007 01:31:44 -0700 (PDT)
From:	david@...g.hm
To:	Rene Herman <rene.herman@...il.com>
cc:	Ray Lee <ray-lk@...rabbit.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Andrew Morton <akpm@...ux-foundation.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: -mm merge plans for 2.6.23

On Wed, 25 Jul 2007, Rene Herman wrote:

> On 07/25/2007 10:07 AM, david@...g.hm wrote:
>
>>  On Wed, 25 Jul 2007, Rene Herman wrote:
>
>> >  Something like this?
>
> [ ... ]
>
>>  when the swap readahead is enabled does it make a significant difference
>>  in the time to do the random access?
>
> I don't use swap prefetch (nor -ck or -mm). If someone who has the patch 
> applied waits to hit enter until swap prefetch has prefetched it all back in 
> again, it certainly will.
>
> Swap prefetch's potential to do larger reads back from swapspace than a 
> random segfaulting app could well be very significant. Reads are dwarved by 
> seeks. If this program does what you wanted, please use it to show us.

I haven't used swap prefetch either, the call was put out for what could 
be used to test the performance, and I was suggesting a test.

if nobody else follows up on this I'll try to get some time to test it 
myself in a day or two.

David Lang
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