linux-kernel - Re: [PATCH] memcgroup: check and initialize page->cgroup in memmap_init

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Message-Id: <20080418140946.e265c1f3.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 18 Apr 2008 14:09:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Shi Weihua <shiwh@...fujitsu.com>, balbir@...ux.vnet.ibm.com,
	xemul@...nvz.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	hugh@...itas.com
Subject: Re: [PATCH] memcgroup: check and initialize page->cgroup in
 memmap_init_zone

On Fri, 18 Apr 2008 12:32:56 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > Or perhaps that page was used and then later freed before we got to
> > memmap_init_zone() and was freed with a non-zero ->page_cgroup.  Which is
> > unlikely given that page.page_cgroup was only just added and is only
> > present if CONFIG_CGROUP_MEM_RES_CTLR.
> > 
> Hmm, I'll try his .config and see what happens.
> 
I reproduced the hang with his config and confirmed his fix works well.
But I can't find why...I'll dig a bit more.

Thanks,
-Kame

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