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

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Date:	Wed, 9 Dec 2009 12:47:27 -0800
From:	Paul Menage <menage@...gle.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com, hugh.dickins@...cali.co.uk,
	nishimura@....nes.nec.co.jp, balbir@...ux.vnet.ibm.com,
	kamezawa.hiroyu@...fujitsu.com, lizf@...fujitsu.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

On Tue, Dec 8, 2009 at 1:16 PM, Andi Kleen <andi@...stfloor.org> wrote:
>
> The hwpoison test suite need to inject hwpoison to a collection of
> selected task pages, and must not touch pages not owned by them and
> thus kill important system processes such as init. (But it's OK to
> mis-hwpoison free/unowned pages as well as shared clean pages.
> Mis-hwpoison of shared dirty pages will kill all tasks, so the test
> suite will target all or non of such tasks in the first place.)

While the functionality sounds useful, the interface (passing an inode
number) feels a bit ugly to me. Also, if that group is deleted and a
new cgroup created, you could end up reusing the inode number.

How about an approach where you write either the cgroup path (relative
to the memcg mount) or an fd open on the desired cgroup? Then you
could store a (counted) css reference rather than an inode number,
which would make the filter function cleaner too, since it would just
need to compare css objects.

Paul
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