Re: [v9 2/5] mm: implement mem_cgroup_scan_tasks() for the root memory cgroup

[Roman Gushchin]

On Tue, Oct 03, 2017 at 12:49:39PM +0200, Michal Hocko wrote:
> On Wed 27-09-17 14:09:33, 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 should be treated as a leaf cgroup,
> > so only tasks which are directly belonging to the root cgroup
> > should be iterated over.
> 
> I would only add that this patch doesn't introduce any functionally
> visible change because we never trigger oom killer with the root memcg
> as the root of the hierarchy. So this is just a preparatory work for
> later changes.

Sure, thanks!

> 
> > Signed-off-by: Roman Gushchin <guro@xxxxxx>
> > Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> > 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: Michal Hocko <mhocko@xxxxxxxx>