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charset="us-ascii" Content-ID: <98243A29FC6FF44DA4B92FB487069E95@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 1f1708b0-0142-4697-d297-08d6ff23c697 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Jul 2019 19:30:44.3119 (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: BN8PR15MB3025 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-02_09:,, 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=606 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907020215 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 02, 2019 at 02:37:30PM -0400, Waiman Long wrote: > Currently, a value of '1" is written to /sys/kernel/slab//shrink > file to shrink the slab by flushing all the per-cpu slabs and free > slabs in partial lists. This applies only to the root caches, though. >=20 > Extends this capability by shrinking all the child memcg caches and > the root cache when a value of '2' is written to the shrink sysfs file. >=20 > On a 4-socket 112-core 224-thread x86-64 system after a parallel kernel > build, the the amount of memory occupied by slabs before shrinking > slabs were: >=20 > # grep task_struct /proc/slabinfo > task_struct 7114 7296 7744 4 8 : tunables 0 0 > 0 : slabdata 1824 1824 0 > # grep "^S[lRU]" /proc/meminfo > Slab: 1310444 kB > SReclaimable: 377604 kB > SUnreclaim: 932840 kB >=20 > After shrinking slabs: >=20 > # grep "^S[lRU]" /proc/meminfo > Slab: 695652 kB > SReclaimable: 322796 kB > SUnreclaim: 372856 kB > # grep task_struct /proc/slabinfo > task_struct 2262 2572 7744 4 8 : tunables 0 0 > 0 : slabdata 643 643 0 >=20 > Signed-off-by: Waiman Long Acked-by: Roman Gushchin Thanks, Waiman!