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charset="us-ascii" Content-ID: <3860E6C379245444B07A25A5321EEF0C@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SA1PR15MB5109.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9bccf117-1f1e-4628-fe59-08d93d1063c5 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Jul 2021 04:18:05.1749 (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: P1ILbCnfC4wySCiWx6twSUKFYtllTgyvqUwGyyoNX+VoydX9uyOW7u522vI3J9ESHfcgNa3tZAm7DSRYqiseGA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR15MB5063 X-OriginatorOrg: fb.com X-Proofpoint-GUID: tr2zSKtTU_YVpdTlh2hvPVy9wTxXPYVH X-Proofpoint-ORIG-GUID: tr2zSKtTU_YVpdTlh2hvPVy9wTxXPYVH X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-01_15:2021-07-01,2021-07-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0 phishscore=0 malwarescore=0 impostorscore=0 mlxlogscore=999 clxscore=1015 mlxscore=0 priorityscore=1501 suspectscore=0 adultscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107020020 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Jul 1, 2021, at 2:12 PM, Namhyung Kim wrote: >=20 > Recently bperf was added to use BPF to count perf events for various > purposes. This is an extension for the approach and targetting to > cgroup usages. >=20 > Unlike the other bperf, it doesn't share the events with other > processes but it'd reduce unnecessary events (and the overhead of > multiplexing) for each monitored cgroup within the perf session. >=20 > When --for-each-cgroup is used with --bpf-counters, it will open > cgroup-switches event per cpu internally and attach the new BPF > program to read given perf_events and to aggregate the results for > cgroups. It's only called when task is switched to a task in a > different cgroup. >=20 > Cc: Song Liu > Signed-off-by: Namhyung Kim Acked-by: Song Liu