From: Johannes Weiner <hannes@cmpxchg.org>
Date: Wed, 10 Dec 2014 23:42:39 +0000 (-0800)
Subject: mm: memcontrol: convert reclaim iterator to simple css refcounting
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~139^2~158
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ac8fb31ad2ebd6492d1c5e8f31846b532f03945;p=pandora-kernel.git

mm: memcontrol: convert reclaim iterator to simple css refcounting

The memcg reclaim iterators use a complicated weak reference scheme to
prevent pinning cgroups indefinitely in the absence of memory pressure.

However, during the ongoing cgroup core rework, css lifetime has been
decoupled such that a pinned css no longer interferes with removal of
the user-visible cgroup, and all this complexity is now unnecessary.

[mhocko@suse.cz: ensure that the cached reference is always released]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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