linux-kernel - Re: [PATCH V3 4/8] memcg: add per cgroup dirty pages accounting

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Message-ID: <20130109144758.GC5095@dhcp22.suse.cz>
Date:	Wed, 9 Jan 2013 15:47:58 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Sha Zhengju <handai.szj@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
	gthelen@...gle.com, fengguang.wu@...el.com, glommer@...allels.com,
	dchinner@...hat.com, Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH V3 4/8] memcg: add per cgroup dirty pages accounting

On Wed 09-01-13 22:35:12, Sha Zhengju wrote:
[...]
> To my knowledge, each task is forked in root memcg, and there's a
> moving while attaching it to a cgroup. So move_account is also a
> frequent behavior to some extent.

Not really. Every fork/exec is copies the current group (see
cgroup_fork) so there is no moving on that path.
[...]
-- 
Michal Hocko
SUSE Labs
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