linux-kernel - Re: Unending loop in __alloc_pages_slowpath following OOM-kill; rfc: patch.

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Message-ID: <4DDC44F0.6090809@jp.fujitsu.com>
Date:	Wed, 25 May 2011 08:53:20 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	mgorman@...e.de
CC:	minchan.kim@...il.com, abarry@...y.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, riel@...hat.com, hannes@...xchg.org,
	linux-kernel@...r.kernel.org
Subject: Re: Unending loop in __alloc_pages_slowpath following OOM-kill; rfc:
 patch.

>> In old days, we always call drain_all_pages() if did_some_progress!=0. But
>> current kernel only call it when get_page_from_freelist() fail. So,
>> wait_iff_congested() may help but no guarantee to help us.
>>
>> If you still strongly worry about IPI cost, I'm concern to move drain_all_pages()
>> to more unfrequently point. but to ignore pcp makes less sense, IMHO.
>>
> 
> Yes, I'm worried about it because excessive time
> spent in drain_all_pages() has come up on the past
> http://lkml.org/lkml/2010/8/23/81 . The PCP lists are not being
> ignored at the moment. They are drained when direct reclaim makes
> forward progress but still fails to allocate a page.

Well, it's no priority==0 case. that's my point.


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