> From: Frederic Weisbecker <fweisbec@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@gmail.com>
> Acked-by: Paul Menage <paul@paulmenage.org>
> Acked-by: Glauber Costa <glommer@parallels.com>
> Cc: Li Zefan <lizf@cn.fujitsu.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Aditya Kali <adityakali@google.com>
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Kay Sievers <kay.sievers@vrfy.org>
> Cc: Tim Hockin <thockin@hockin.org>
> Cc: Tejun Heo <htejun@gmail.com>
> Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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