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Thu, 18 Jul 2019 17:05:05 +0000 From: Roman Gushchin To: Christopher Lameter CC: Waiman Long , Pekka Enberg , "David Rientjes" , Joonsoo Kim , "Andrew Morton" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Michal Hocko , "Johannes Weiner" , Shakeel Butt , "Vladimir Davydov" Subject: Re: [PATCH v2 1/2] mm, slab: Extend slab/shrink to shrink all memcg caches Thread-Topic: [PATCH v2 1/2] mm, slab: Extend slab/shrink to shrink all memcg caches Thread-Index: AQHVPN3TlomcCJJgFEONei6lr3vfPKbQQNKAgABbTQA= Date: Thu, 18 Jul 2019 17:05:04 +0000 Message-ID: <20190718170458.GA6139@castle.dhcp.thefacebook.com> References: <20190717202413.13237-1-longman@redhat.com> <20190717202413.13237-2-longman@redhat.com> <0100016c04e0192f-299df02d-a35f-46db-9833-37ba7a01f5f0-000000@email.amazonses.com> In-Reply-To: <0100016c04e0192f-299df02d-a35f-46db-9833-37ba7a01f5f0-000000@email.amazonses.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR15CA0043.namprd15.prod.outlook.com (2603:10b6:300:ad::29) To DM6PR15MB2635.namprd15.prod.outlook.com (2603:10b6:5:1a6::24) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [2620:10d:c091:500::f13c] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 05be2f81-de36-44b7-4bba-08d70ba21433 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:DM6PR15MB3212; 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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 05be2f81-de36-44b7-4bba-08d70ba21433 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Jul 2019 17:05:05.0346 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: guro@fb.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR15MB3212 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-18_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=868 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907180179 X-FB-Internal: deliver 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 Thu, Jul 18, 2019 at 11:38:11AM +0000, Christopher Lameter wrote: > On Wed, 17 Jul 2019, Waiman Long wrote: >=20 > > Currently, a value of '1" is written to /sys/kernel/slab//shrink > > file to shrink the slab by flushing out all the per-cpu slabs and free > > slabs in partial lists. This can be useful to squeeze out a bit more me= mory > > under extreme condition as well as making the active object counts in > > /proc/slabinfo more accurate. >=20 > Acked-by: Christoph Lameter >=20 > > # grep task_struct /proc/slabinfo > > task_struct 53137 53192 4288 61 4 : tunables 0 0 > > 0 : slabdata 872 872 0 > > # grep "^S[lRU]" /proc/meminfo > > Slab: 3936832 kB > > SReclaimable: 399104 kB > > SUnreclaim: 3537728 kB > > > > After shrinking slabs: > > > > # grep "^S[lRU]" /proc/meminfo > > Slab: 1356288 kB > > SReclaimable: 263296 kB > > SUnreclaim: 1092992 kB >=20 > Well another indicator that it may not be a good decision to replicate th= e > whole set of slabs for each memcg. Migrate the memcg ownership into the > objects may allow the use of the same slab cache. In particular together > with the slab migration patches this may be a viable way to reduce memory > consumption. >=20 Btw I'm working on an alternative solution. It's way too early to present anything, but preliminary results are looking promising: slab memory usage is decreased by 10-40% depending on the workload. Thanks!