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Date: Wed, 28 Oct 2020 17:16:35 -0700 From: Roman Gushchin <guro@...com> To: Muchun Song <songmuchun@...edance.com> CC: <hannes@...xchg.org>, <mhocko@...nel.org>, <vdavydov.dev@...il.com>, <akpm@...ux-foundation.org>, <shakeelb@...gle.com>, <iamjoonsoo.kim@....com>, <laoar.shao@...il.com>, <chris@...isdown.name>, <christian.brauner@...ntu.com>, <peterz@...radead.org>, <mingo@...nel.org>, <keescook@...omium.org>, <tglx@...utronix.de>, <esyr@...hat.com>, <surenb@...gle.com>, <areber@...hat.com>, <elver@...gle.com>, <linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>, <linux-mm@...ck.org> Subject: Re: [PATCH v2] mm: memcg/slab: Fix return child memcg objcg for root memcg On Wed, Oct 28, 2020 at 11:50:10AM +0800, Muchun Song wrote: > Consider the following memcg hierarchy. > > root > / \ > A B > > If we get the objcg of memcg A failed, the get_obj_cgroup_from_current > can return the wrong objcg for the root memcg. > > Fixes: bf4f059954dc ("mm: memcg/slab: obj_cgroup API") > Signed-off-by: Muchun Song <songmuchun@...edance.com> Acked-by: Roman Gushchin <guro@...com> Thanks!
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