linux-kernel - Re: [PATCH 2/6] cgroup: improve old cgroup handling in cgroup_attach

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Message-Id: <20110826131359.096a8131.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 26 Aug 2011 13:13:59 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	rjw@...k.pl, paul@...lmenage.org, lizf@...fujitsu.com,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, fweisbec@...il.com,
	matthltc@...ibm.com
Subject: Re: [PATCH 2/6] cgroup: improve old cgroup handling in
 cgroup_attach_proc()

On Fri, 26 Aug 2011 00:43:08 +0200
Tejun Heo <tj@...nel.org> wrote:

> cgroup_attach_proc() behaves differently from cgroup_attach_task() in
> the following aspects.
> 
> * All hooks are invoked even if no task is actually being moved.
> 
> * ->can_attach_task() is called for all tasks in the group whether the
>   new cgrp is different from the current cgrp or not; however,
>   ->attach_task() is skipped if new equals new.  This makes the calls
>   asymmetric.
> 
> This patch improves old cgroup handling in cgroup_attach_proc() by
> looking up the current cgroup at the head, recording it in the flex
> array along with the task itself, and using it to remove the above two
> differences.  This will also ease further changes.
> 
> -v2: nr_todo renamed to nr_migrating_tasks as per Paul Menage's
>      suggestion.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Acked-by: Paul Menage <paul@...lmenage.org>
> Cc: Li Zefan <lizf@...fujitsu.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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