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

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Message-ID: <48083506.7080909@cn.fujitsu.com>
Date:	Fri, 18 Apr 2008 13:43:34 +0800
From:	Shi Weihua <shiwh@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	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

KAMEZAWA Hiroyuki wrote::
> 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.

If i use CONFIG_SPARSEMEM instead of CONFIG_DISCONTIGMEM, the kernel 
boots successfully.

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