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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OSBPR01MB4600.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 26d5ccf4-5be4-441a-6f0b-08d92f04867c X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Jun 2021 07:17:53.1732 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: BGx6LNOfKfDsq+vVjzeIsOk6fEPpKBpU0v4TEy3LfgSeOEM2M7Izx4ipDnz5am2/QlFEyXccXcSmEv0nB6JpRzvArolqKspvTO/IRVHRYNw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: OSBPR01MB4197 Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org Hello.=0A= =0A= perf_evsel__open cannot create an event group because it set group_fd=0A= to -1 when it ran perf_event_open.=0A= Is there any reason why group_fd is fixed at -1?=0A= =0A= Best Regards=0A= Shunsuke=0A=