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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