From: Johannes Weiner <hannes@cmpxchg.org>
Date: Thu, 12 Nov 2015 18:41:23 -0500

When a cgroup currently breaches its socket memory limit, it enters
memory pressure mode for itself and its *ancestors*. This throttles
transmission in unrelated sibling and cousin subtrees that have
nothing to do with the breached limit.

On the contrary, breaching a limit should make that group and its
*children* enter memory pressure mode. But this happens already,
albeit lazily: if an ancestor limit is breached, siblings will enter
memory pressure on their own once the next packet arrives for them.

So no additional hierarchy code is needed. Remove the bogus stuff.

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

Acked-by: David S. Miller <davem@davemloft.net>