vmscan: fix sane_reclaim helper for legacy memcg
authorVladimir Davydov <vdavydov@parallels.com>
Tue, 22 Sep 2015 21:59:20 +0000 (14:59 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 22 Sep 2015 22:09:53 +0000 (15:09 -0700)
commitd5028f9f7d8de5c375c52b98976b6f310e73398f
treef890e8ebe10bbfbf2252de20d1fb9d60c1b425b8
parentd046b770c9fc36ccb19c27afdb8322220108cbc7
vmscan: fix sane_reclaim helper for legacy memcg

The sane_reclaim() helper is supposed to return false for memcg reclaim
if the legacy hierarchy is used, because the latter lacks dirty
throttling mechanism, and so it did before it was accidentally broken by
commit 33398cf2f360c ("memcg: export struct mem_cgroup").  Fix it.

Fixes: 33398cf2f360c ("memcg: export struct mem_cgroup")
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmscan.c