Re: [PATCH 06/10] cgroup: improve old cgroup handling incgroup_attach_proc()

[Frederic Weisbecker]

On Tue, Nov 01, 2011 at 04:46:29PM -0700, Tejun Heo 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@xxxxxxxxxx>
> Acked-by: Paul Menage <paul@xxxxxxxxxxxxxx>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>

Reviewed-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
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