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

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Message-ID: <Pine.LNX.4.64.0707250132520.18679@asgard.lang.hm>
Date:	Wed, 25 Jul 2007 01:33:45 -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, david@...g.hm wrote:

> 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.

this assumes that this isn't ruled an invalid test in the meantime.

in any case thanks for codeing this up so quickly.

David Lang
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