linux-kernel - Re: [bad page] memcg: another bad page at page migration (2.6.26-rc5-mm3 + patch collection)

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Message-Id: <20080624122626.913030bd.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 24 Jun 2008 12:26:26 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-mm@...ck.org, balbir@...ux.vnet.ibm.com, xemul@...nvz.org,
	linux-kernel@...r.kernel.org
Subject: Re: [bad page] memcg: another bad page at page migration
 (2.6.26-rc5-mm3 + patch collection)

On Tue, 24 Jun 2008 12:22:57 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Tue, 24 Jun 2008 10:37:09 +0900
> Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> 
> > > I don't use shmem explicitly, but I'll test this patch anyway
> > > and report the result.
> > > 
> > Unfortunately, this patch doesn't solve my problem, hum...
> > I'll dig more, too.
> > In my test, I don't use large amount of memory, so I think
> > no swap activities happens, perhaps.
> > 
> Sigh, one hint in the log is
> ==
> Bad page state in process 'switch.sh'
> page:ffffe2000c8e59c0 flags:0x0200000000080018 mapping:000
> 0000000000000 mapcount:0 count:0
> cgroup:ffff81062a817050
> ==
> 
> - the page was mapped one.
> - a page is swapbacked ....Anon or Shmem/tmpfs.
> - mapping is NULL
> 
ignore this... free_hot_cold_page() clears page->mapping. (--;

-Kame

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