linux-kernel - Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

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Message-ID: <20091209091510.GE18989@one.firstfloor.org>
Date:	Wed, 9 Dec 2009 10:15:10 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andi Kleen <andi@...stfloor.org>, kosaki.motohiro@...fujitsu.com,
	hugh.dickins@...cali.co.uk, nishimura@....nes.nec.co.jp,
	balbir@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	menage@...gle.com, npiggin@...e.de, fengguang.wu@...el.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

> I have a question, can try_get_mem_cgroup_from_page() return
> root_mem_cgroup?

It could be called for any page.


> if it can, then css->cgroup->dentry is NULL, if memcg is
> not mounted and there is no subdir in memcg. Because the root
> cgroup of an inactive subsystem has no dentry.

Thanks. I'll just add an return -EINVAL for this case, sounds good?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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