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Thu, 31 Oct 2019 11:16:09 -0700 (PDT) Received: from [2620:15c:17:3:3a5:23a7:5e32:4598] ([2620:15c:17:3:3a5:23a7:5e32:4598]) by smtp.gmail.com with ESMTPSA id 74sm3620489pgb.62.2019.10.31.11.16.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Oct 2019 11:16:08 -0700 (PDT) Date: Thu, 31 Oct 2019 11:16:07 -0700 (PDT) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: Roman Gushchin cc: linux-mm@kvack.org, Andrew Morton , Michal Hocko , Johannes Weiner , linux-kernel@vger.kernel.org, kernel-team@fb.com, Vladimir Davydov , Daniel Jordan Subject: Re: [PATCH v2] mm: slab: make page_cgroup_ino() to recognize non-compound slab pages properly In-Reply-To: <20191031012151.2722280-1-guro@fb.com> Message-ID: References: <20191031012151.2722280-1-guro@fb.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 30 Oct 2019, Roman Gushchin wrote: > page_cgroup_ino() doesn't return a valid memcg pointer for non-compound > slab pages, because it depends on PgHead AND PgSlab flags to be set > to determine the memory cgroup from the kmem_cache. > It's correct for compound pages, but not for generic small pages. Those > don't have PgHead set, so it ends up returning zero. > > Fix this by replacing the condition to PageSlab() && !PageTail(). > > Before this patch: > [root@localhost ~]# ./page-types -c /sys/fs/cgroup/user.slice/user-0.slice/user@0.service/ | grep slab > 0x0000000000000080 38 0 _______S___________________________________ slab > > After this patch: > [root@localhost ~]# ./page-types -c /sys/fs/cgroup/user.slice/user-0.slice/user@0.service/ | grep slab > 0x0000000000000080 147 0 _______S___________________________________ slab > > Fixes: 4d96ba353075 ("mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages") > Signed-off-by: Roman Gushchin > Reviewed-by: Shakeel Butt > Cc: Vladimir Davydov > Cc: Daniel Jordan Acked-by: David Rientjes