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authorVladimir Davydov <vdavydov@parallels.com>2015-09-23 00:59:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-23 01:09:53 +0300
commitd5028f9f7d8de5c375c52b98976b6f310e73398f (patch)
treef890e8ebe10bbfbf2252de20d1fb9d60c1b425b8 /mm
parentd046b770c9fc36ccb19c27afdb8322220108cbc7 (diff)
downloadlinux-d5028f9f7d8de5c375c52b98976b6f310e73398f.tar.xz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmscan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2d978b28a410..7f63a9381f71 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -175,7 +175,7 @@ static bool sane_reclaim(struct scan_control *sc)
if (!memcg)
return true;
#ifdef CONFIG_CGROUP_WRITEBACK
- if (memcg->css.cgroup)
+ if (cgroup_on_dfl(memcg->css.cgroup))
return true;
#endif
return false;