Messages in this thread Patch in this message | | | From | Wei Yang <> | Subject | [PATCH 3/4] mm/memcg: retrieve parent memcg from css.parent | Date | Tue, 11 Jan 2022 01:03:01 +0000 |
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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@gmail.com> --- 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
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