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Wed, 18 Sep 2019 22:23:21 +0000 From: Roman Gushchin To: "Saeed Karimabadi (skarimab)" CC: Christoph Lameter , Pekka Enberg , "David Rientjes" , Joonsoo Kim , "Andrew Morton" , "linux-mm@kvack.org" , Tejun Heo , Li Zefan , Johannes Weiner , "cgroups@vger.kernel.org" , Michal Hocko , Vladimir Davydov , "xe-linux-external(mailer list)" Subject: Re: CGroup unused allocated slab objects will not get released Thread-Topic: CGroup unused allocated slab objects will not get released Thread-Index: AdVuYAXsyqrfLm5yRGqVq9iRkUoA5QAD6QWA Date: Wed, 18 Sep 2019 22:23:21 +0000 Message-ID: <20190918222315.GA16105@castle> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR21CA0030.namprd21.prod.outlook.com (2603:10b6:300:129::16) To BN8PR15MB2626.namprd15.prod.outlook.com (2603:10b6:408:c7::28) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [2620:10d:c090:180::e152] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d1b0ab54-ff0f-4a77-1129-08d73c86cfec x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600167)(711020)(4605104)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:BN8PR15MB2833; 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charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: d1b0ab54-ff0f-4a77-1129-08d73c86cfec X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Sep 2019 22:23:21.0901 (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: aYRPMd1GD7wWcqRjVMhJYtHT48fe1P7ANmaPQTx279/tEyNPmdBPZtkcY9vEY9vq X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR15MB2833 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.70,1.0.8 definitions=2019-09-18_10:2019-09-18,2019-09-18 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 mlxscore=0 spamscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 clxscore=1011 malwarescore=0 priorityscore=1501 bulkscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1909180187 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 Wed, Sep 18, 2019 at 08:31:18PM +0000, Saeed Karimabadi (skarimab) wrote= : > Hi =A0Kernel Maintainers, >=20 > We are chasing an issue where slab allocator is not releasing task_struct= slab objects allocated by cgroups=20 > and we are wondering if this is a known issue or an expected behavior ? > If we stress test the system and spawn multiple tasks with different cgro= ups, number of active allocated=20 > task_struct objects will increase but kernel will never release those mem= ory later on, even though if system=20 > goes to the idle state with lower number of the running processes. Hi Saeed! I've recently proposed a new slab memory cgroup controller, which aims to s= olve the problem you're describing: https://lwn.net/Articles/798605/ . It also g= enerally reduces the amount of memory used by slabs. I've been told that not all e-mails in the patchset reached lkml, so, please, find the original patchset here: https://github.com/rgushchin/linux/tree/new_slab.rfc and it's backport to the 5.3 release here: https://github.com/rgushchin/linux/tree/new_slab.rfc.v5.3 If you can try it on your setup, I'd appreciate it a lot, and it also can help with merging it upstream soon. Thank you! Roman