Commit d5028f9f authored Sep 22, 2015 by Vladimir Davydov Committed by Linus Torvalds Sep 22, 2015

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 33398cf2 ("memcg: export struct mem_cgroup").  Fix it.

Fixes: 33398cf2 ("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>

parent d046b770

mm/vmscan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;