From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3DAD6453 for ; Tue, 22 Mar 2022 21:40:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 806F9C340EC; Tue, 22 Mar 2022 21:40:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1647985217; bh=vzhFL6mlQti7d58JDlxxBNhVkqwV3XQfc4/UNOriJag=; h=Date:To:From:In-Reply-To:Subject:From; b=0sRv+MWOIF0jYQ4lKQICEGXrbbm9gidGVdF7HQoZOJi8PbT72N0UkStaKuBIVeAjW QCMMAdOxBx0jBdh5UVu46K8rclguFGyzbIZA8bT5kiGsyfuUbT1kko2RX4tK62IQo6 hoQAATH5/iIIUfWpr+DTng1bTAMox5RQipJzHJxE= Date: Tue, 22 Mar 2022 14:40:16 -0700 To: vdavydov.dev@gmail.com,vbabka@suse.cz,surenb@google.com,songmuchun@bytedance.com,shy828301@gmail.com,shakeelb@google.com,rppt@linux.ibm.com,roman.gushchin@linux.dev,mhocko@suse.com,hannes@cmpxchg.org,guro@fb.com,richard.weiyang@gmail.com,akpm@linux-foundation.org,patches@lists.linux.dev,linux-mm@kvack.org,mm-commits@vger.kernel.org,torvalds@linux-foundation.org,akpm@linux-foundation.org From: Andrew Morton In-Reply-To: <20220322143803.04a5e59a07e48284f196a2f9@linux-foundation.org> Subject: [patch 035/227] mm/memcg: retrieve parent memcg from css.parent Message-Id: <20220322214017.806F9C340EC@smtp.kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: From: Wei Yang Subject: 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. Link: https://lkml.kernel.org/r/20220201004643.8391-2-richard.weiyang@gmail.com Signed-off-by: Wei Yang Reviewed-by: Muchun Song Acked-by: Michal Hocko Reviewed-by: Roman Gushchin Reviewed-by: Shakeel Butt Cc: Roman Gushchin Cc: Johannes Weiner Cc: Vladimir Davydov Cc: Yang Shi Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Mike Rapoport Signed-off-by: Andrew Morton --- include/linux/memcontrol.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/include/linux/memcontrol.h~mm-memcg-retrieve-parent-memcg-from-cssparent +++ a/include/linux/memcontrol.h @@ -842,9 +842,7 @@ static inline struct mem_cgroup *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, _