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

[Johannes Weiner]

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@xxxxxx>
> Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Cc: David Rientjes <rientjes@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Tejun Heo <tj@xxxxxxxxxx>
> Cc: kernel-team@xxxxxx
> Cc: cgroups@xxxxxxxxxxxxxxx
> Cc: linux-doc@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>