Re: [v10 2/6] mm: implement mem_cgroup_scan_tasks() for the root memory cgroup

Johannes Weiner
2017-10-04T19:16:07Z

On Wed, Oct 04, 2017 at 04:46:34PM +0100, Roman Gushchin wrote:
> Implement mem_cgroup_scan_tasks() functionality for the root
> memory cgroup to use this function for looking for a OOM victim
> task in the root memory cgroup by the cgroup-ware OOM killer.
>
> The root memory cgroup is treated as a leaf cgroup, so only tasks
> which are directly belonging to the root cgroup are iterated over.
>
> This patch doesn't introduce any functional change as
> mem_cgroup_scan_tasks() is never called for the root memcg.
> This is preparatory work for the cgroup-aware OOM killer,
> which will use this function to iterate over tasks belonging
> to the root memcg.
>
> Signed-off-by: Roman Gushchin <guro@fb.com>
> Acked-by: Michal Hocko <mhocko@suse.com>
> Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: kernel-team@fb.com
> Cc: cgroups@vger.kernel.org
> Cc: linux-doc@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-mm@kvack.org

Acked-by: Johannes Weiner <hannes@cmpxchg.org>