[PATCH stable-4.4 0/3 v2] backport memcg id patches

[Michal Hocko]

Hi,
this is my attempt to backport Johannes' 73f576c04b94 ("mm: memcontrol:
fix cgroup creation failure after many small jobs") to 4.4 based stable
kernel. The backport is not straightforward and there are 2 follow up
fixes on top of this commit. I would like to integrate these to our SLES
based kernel and believe other users might benefit from the backport as
well. All 3 patches are in the Linus tree already.

This is the second version which addresses review feedback from Johannes [1]

[1] http://lkml.kernel.org/r/20160815123407.GA1153@xxxxxxxxxxx