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Date: Sat, 22 Nov 2008 10:16:25 +0800
From: Li Zefan <lizf@cn.fujitsu.com>
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: "linux-mm@kvack.org" <linux-mm@kvack.org>,
       "balbir@linux.vnet.ibm.com" <balbir@linux.vnet.ibm.com>,
       "nishimura@mxp.nes.nec.co.jp" <nishimura@mxp.nes.nec.co.jp>,
       pbadari@us.ibm.com, jblunck@suse.de, taka@valinux.co.jp,
       "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       npiggin@suse.de
Subject: Re: [PATCH 0/2] memcg: fix oom handling
References: <20081114191246.4f69ff31.kamezawa.hiroyu@jp.fujitsu.com>	<20081114191949.926bf99d.kamezawa.hiroyu@jp.fujitsu.com>	<49261F87.50209@cn.fujitsu.com> <20081121185829.e04c8116.kamezawa.hiroyu@jp.fujitsu.com>
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KAMEZAWA Hiroyuki wrote:
> Li Zefan reported
> 
> (a) This goes dead lock:
> ==
>    #echo 0 >  (...)/01/memory.limit_in_bytes   #set memcg's limit to 0,
>    #echo $$ > (...)/01/memory.tasks            #move task
>    # do something...
> ==
> 
> (b) seems to be dead lock
> ==
>    #echo 40k >  (...)/01/memory.limit_in_bytes   #set memcg's limit to 0,
>    #echo $$ > (...)/01/memory.tasks            #move task
>    # do something...
> ==
> 
> 
> I think (a) is BUG. (b) is just slow down.
> (you can see pgpgin/pgpgout count is increasing in (B).)
> 
> This patch set is for handling (a). Li-san, could you check ?

Yes, it works for me now. :)

> This works well in my environment.(means OOM-Killer is called in proper way.)
>