Message-ID: <4DDB7C1D.8040300@jp.fujitsu.com>
Date: Tue, 24 May 2011 18:36:29 +0900
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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To: minchan.kim@gmail.com
CC: abarry@cray.com, akpm@linux-foundation.org, linux-mm@kvack.org,
        mgorman@suse.de, riel@redhat.com, hannes@cmpxchg.org,
        linux-kernel@vger.kernel.org, fengguang.wu@intel.com
Subject: Re: Unending loop in __alloc_pages_slowpath following OOM-kill; rfc:
 patch.
References: <4DCDA347.9080207@cray.com>	<BANLkTikiXUzbsUkzaKZsZg+5ugruA2JdMA@mail.gmail.com>	<4DD2991B.5040707@cray.com>	<BANLkTimYEs315jjY9OZsL6--mRq3O_zbDA@mail.gmail.com>	<20110520164924.GB2386@barrios-desktop>	<4DDB3A1E.6090206@jp.fujitsu.com>	<BANLkTinkcu5j1H8tHNT4aTmOL-GXfSwPQw@mail.gmail.com>	<4DDB6F48.1010809@jp.fujitsu.com> <BANLkTimbu0pDNb1cHGu0B6P-foRHQ2uiWw@mail.gmail.com>
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>> Can you please tell me previous discussion url or mail subject?
>> I mean, if it is costly and performance degression risk, we don't have to
>> take my idea.
> 
> Yes. You could see it by https://lkml.org/lkml/2011/4/30/81.

I think Wu pointed out "lightweight vmscan could reclaim pages but stealed
from another task case". It's very different with "most heavyweight vmscan
still failed to reclaim any pages". The point is, IPIs cost depend on the
frequency. stealing frequently occur on current logic, but vmscan priority==0
is?


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