[Devel] Re: [PATCH v2 11/29] cgroups: ability to stop res charge propagation on bounded ancestor

[KAMEZAWA Hiroyuki]

(2012/05/12 2:44), Glauber Costa wrote:

> From: Frederic Weisbecker <fweisbec at gmail.com>
> 
> Moving a task from a cgroup to another may require to substract its
> resource charge from the old cgroup and add it to the new one.
> 
> For this to happen, the uncharge/charge propagation can just stop when we
> reach the common ancestor for the two cgroups.  Further the performance
> reasons, we also want to avoid to temporarily overload the common
> ancestors with a non-accurate resource counter usage if we charge first
> the new cgroup and uncharge the old one thereafter.  This is going to be a
> requirement for the coming max number of task subsystem.
> 
> To solve this, provide a pair of new API that can charge/uncharge a
> resource counter until we reach a given ancestor.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec at gmail.com>
> Acked-by: Paul Menage <paul at paulmenage.org>
> Acked-by: Glauber Costa <glommer at parallels.com>
> Cc: Li Zefan <lizf at cn.fujitsu.com>
> Cc: Johannes Weiner <hannes at cmpxchg.org>
> Cc: Aditya Kali <adityakali at google.com>
> Cc: Oleg Nesterov <oleg at redhat.com>
> Cc: Kay Sievers <kay.sievers at vrfy.org>
> Cc: Tim Hockin <thockin at hockin.org>
> Cc: Tejun Heo <htejun at gmail.com>
> Acked-by: Kirill A. Shutemov <kirill at shutemov.name>
> Signed-off-by: Andrew Morton <akpm at linux-foundation.org>


Where is this function called in this series ?

Thanks,
-Kame