linux-kernel - Re: [PATCH] mm: check zone->all_unreclaimable in all

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Message-Id: <20110310224939.F926.A69D9226@jp.fujitsu.com>
Date:	Thu, 10 Mar 2011 23:08:39 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, avagin@...il.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrey Vagin <avagin@...nvz.org>, Mel Gorman <mel@....ul.ie>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: check zone->all_unreclaimable in all_unreclaimable()

> Hi, 
> 
> Hmmm...
> If I could observed your patch, I did support your opinion. but I didn't. so, now I'm 
> curious why we got the different conclusion. tommorow, I'll try to construct a test 
> environment to reproduce your system.

Hm, 

following two patches seems to have bad interaction. former makes
SCHED_FIFO when OOM, latter makes CPU 100% occupied busy loop if
LRU is really tight.
Of cource, I need to run more much test. I'll digg it more at this 
weekend (maybe).


commit 93b43fa55088fe977503a156d1097cc2055449a2
Author: Luis Claudio R. Goncalves <lclaudio@...g.org>
Date:   Mon Aug 9 17:19:41 2010 -0700

    oom: give the dying task a higher priority


commit 0e093d99763eb4cea09f8ca4f1d01f34e121d10b
Author: Mel Gorman <mel@....ul.ie>
Date:   Tue Oct 26 14:21:45 2010 -0700

    writeback: do not sleep on the congestion queue if there are no congested BDIs or if significant conge



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