On Fri, 28 Mar 2008 20:15:28 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> Now,
> - css_get(memcgrp) is called at mm_struct initialization.
> - css_put(memcgrp) is called at mm_struct freeing.
> 
> How about
> - css_get(memcgrp) is called at task_struct initialization.
> - css_put(memcgrp) is called at task_struct freeing.
> 
> Because
> 1. we find mem_cgroup by mm->owner, after this.
> 2. generic group interface have exit() and clone() callback interface.
> 
> mem_cgroup will not be freed until rmdir(), anyway.
> 
Ignore above. As Paul pointed out, reference count from task is not necessary.

Thanks,
-Kame