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Tue, 21 Jul 2020 10:42:22 -0700 (PDT) Date: Tue, 21 Jul 2020 13:41:26 -0400 From: Johannes Weiner To: jingrui Cc: "tj@kernel.org" , Lizefan , "mhocko@kernel.org" , "vdavydov.dev@gmail.com" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" , "cgroups@vger.kernel.org" , "linux-kernel@vger.kernel.org" , caihaomin , "Weiwei (N)" , guro@cmpxchg.org Subject: Re: PROBLEM: cgroup cost too much memory when transfer small files to tmpfs Message-ID: <20200721174126.GA271870@cmpxchg.org> References: <2E04DD7753BE0E4ABABF0B664610AD6F2620CAF7@dggeml528-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <2E04DD7753BE0E4ABABF0B664610AD6F2620CAF7@dggeml528-mbx.china.huawei.com> X-Rspamd-Queue-Id: A0F83180AC6CA X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 Content-Transfer-Encoding: quoted-printable 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 Tue, Jul 21, 2020 at 11:19:52AM +0000, jingrui wrote: > Cc: Johannes Weiner ; Michal Hocko ; Vladimir Davydov >=20 > Thanks. >=20 > --- > PROBLEM: cgroup cost too much memory when transfer small files to tmpfs= . >=20 > keywords: cgroup PERCPU/memory cost too much. >=20 > description: >=20 > We send small files from node-A to node-B tmpfs /tmp directory using sf= tp. On > node-B the systemd configured with pam on like below. >=20 > cat /etc/pam.d/password-auth | grep systemd > -session=A0=A0=A0=A0 optional=A0=A0=A0=A0=A0 pam_systemd.so >=20 > So when transfer a file, a systemd session is created, that means a cgr= oup is > created, then file saved at /tmp will associated with a cgroup object. = After > file transferred, session and cgroup-dir will be removed, but the file = in /tmp > still associated with the cgroup object. The PERCPU memory in cgroup/cs= s object > cost a lot(about 0.5MB/per-cgroup-object) on 200/cpus machine. CC Roman who had a patch series to free all this extended (percpu) memory upon cgroup deletion: https://lore.kernel.org/patchwork/cover/1050508/ It looks like it never got merged for some reason.