We should start kmem accounting for a memory cgroup only after both its
kmem limit is set (KMEM_ACCOUNTED_ACTIVE) and related call sites are
patched (KMEM_ACCOUNTED_ACTIVATED). Currently memcg_can_account_kmem()
allows kmem accounting even if only one of the conditions is true.
Fix it.

Signed-off-by: Vladimir Davydov <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
---
 mm/memcontrol.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f1a0ae6..40efb9d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2956,7 +2956,8 @@ static DEFINE_MUTEX(set_limit_mutex);
 static inline bool memcg_can_account_kmem(struct mem_cgroup *memcg)
 {
        return !mem_cgroup_disabled() && !mem_cgroup_is_root(memcg) &&
-               (memcg->kmem_account_flags & KMEM_ACCOUNTED_MASK);
+               (memcg->kmem_account_flags & KMEM_ACCOUNTED_MASK) ==
+                                                       KMEM_ACCOUNTED_MASK;
 }
 
 /*
-- 
1.7.10.4

_______________________________________________
Devel mailing list
[email protected]
https://lists.openvz.org/mailman/listinfo/devel

Reply via email to