linux-kernel - Re: [PATCH] vmscan: do not evict inactive pages when skipping an active list scan

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Date:	Wed, 25 Nov 2009 15:47:53 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	lwoodman@...hat.com, kosaki.motohiro@...itsu.co.jp,
	Tomasz Chmielewski <mangoo@...g.org>, akpm@...ux-foundation.org
Subject: Re: [PATCH] vmscan: do not evict inactive pages when skipping an
 active list scan

On 11/25/2009 03:35 PM, Johannes Weiner wrote:
> Hello all,
>
> On Wed, Nov 25, 2009 at 01:37:52PM -0500, Rik van Riel wrote:
>    
>> In AIM7 runs, recent kernels start swapping out anonymous pages
>> well before they should.  This is due to shrink_list falling
>> through to shrink_inactive_list if !inactive_anon_is_low(zone, sc),
>> when all we really wanted to do is pre-age some anonymous pages to
>> give them extra time to be referenced while on the inactive list.
>>      
> I do not quite understand what changed 'recently'.
>
> That fall-through logic to keep eating inactives when the ratio is off
> came in a year ago with the second-chance-for-anon-pages patch..?
>
>    
The confusion comes from my use of the word
"recently" here.  Larry started testing with
RHEL 5 as the baseline.

And yeah - I believe the code may well have
been wrong ever since it was merged. The
indentation just looked so pretty that noone
spotted the bug.

> Acked-by: Johannes Weiner<hannes@...xchg.org>
>
>    
Thank you.
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