linux-kernel - [PATCH 2/2] mm/memcg: retrieve parent memcg from css.parent

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Message-Id: <20220201004643.8391-2-richard.weiyang@gmail.com>
Date:   Tue,  1 Feb 2022 00:46:43 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        akpm@...ux-foundation.org, shakeelb@...gle.com, guro@...com,
        willy@...radead.org, songmuchun@...edance.com, shy828301@...il.com,
        surenb@...gle.com
Cc:     linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, vbabka@...e.cz,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH 2/2] mm/memcg: retrieve parent memcg from css.parent

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@...il.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Michal Hocko <mhocko@...e.com>
Reviewed-by: Roman Gushchin <guro@...com>
Reviewed-by: Shakeel Butt <shakeelb@...gle.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