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Message-Id: <1425317939-13305-1-git-send-email-hannes@cmpxchg.org> Date: Mon, 2 Mar 2015 12:38:59 -0500 From: Johannes Weiner <hannes@...xchg.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Vladimir Davydov <vdavydov@...allels.com>, Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [patch] memcg: disable hierarchy support if bound to the legacy cgroup hierarchy From: Vladimir Davydov <vdavydov@...allels.com> If the memory cgroup controller is initially mounted in the scope of the default cgroup hierarchy and then remounted to a legacy hierarchy, it will still have hierarchy support enabled, which is incorrect. We should disable hierarchy support if bound to the legacy cgroup hierarchy. Signed-off-by: Vladimir Davydov <vdavydov@...allels.com> Signed-off-by: Johannes Weiner <hannes@...xchg.org> --- mm/memcontrol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Andrew, could you please pick this up for 4.0? I don't think it's urgent enough for -stable, though. Thanks! diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0c86945bcc9a..68d4890fc4bd 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5238,7 +5238,9 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css) * on for the root memcg is enough. */ if (cgroup_on_dfl(root_css->cgroup)) - mem_cgroup_from_css(root_css)->use_hierarchy = true; + root_mem_cgroup->use_hierarchy = true; + else + root_mem_cgroup->use_hierarchy = false; } static u64 memory_current_read(struct cgroup_subsys_state *css, -- 2.3.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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