The parent we get from page_counter is correct, while this is two
different hierarchy.
Let's retrieve the parent memcg from css.parent just like parent_cs(),
blkcg_parent(), etc.
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Roman Gushchin <guro@xxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
---
include/linux/memcontrol.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0c5c403f4be6..12bf443f7b14 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -886,9 +886,7 @@ static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec)
*/
static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{
- if (!memcg->memory.parent)
- return NULL;
- return mem_cgroup_from_counter(memcg->memory.parent, memory);
+ return mem_cgroup_from_css(memcg->css.parent);
}
static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
--
2.33.1
