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Tue, 24 Nov 2020 23:31:49 +0000 From: Song Liu To: Jiri Olsa CC: open list , Kernel Team , Peter Ziljstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , "namhyung@kernel.org" Subject: Re: [RFC 2/2] perf-stat: enable counting events for BPF programs Thread-Topic: [RFC 2/2] perf-stat: enable counting events for BPF programs Thread-Index: AQHWvi+l7AybrLX1mkWxO3oxzMTbKKnWaamAgAGN64A= Date: Tue, 24 Nov 2020 23:31:49 +0000 Message-ID: <86F842B0-BF89-4418-BA2E-F93E50726A81@fb.com> References: <20201119045046.1491106-1-songliubraving@fb.com> <20201119045046.1491106-3-songliubraving@fb.com> <20201123234735.GB2088148@krava> In-Reply-To: <20201123234735.GB2088148@krava> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3608.120.23.2.4) authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=fb.com; x-originating-ip: [2620:10d:c090:400::5:f2e3] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bbcde9c8-1c78-4aed-97fd-08d890d11dbe x-ms-traffictypediagnostic: BYAPR15MB2776: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-fb-source: Internal x-ms-oob-tlc-oobclassifiers: OLM:9508; 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charset="us-ascii" Content-ID: <6AA983C82462EF4C88FC627E4A1C2283@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB2999.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: bbcde9c8-1c78-4aed-97fd-08d890d11dbe X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Nov 2020 23:31:49.3220 (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: iZ74NHQ09ij3MPPYiqrd4Q4ScATZ9MbGZ63sLs9eGhVoCtCXQmAhXgrqT/cKUF/0CZOlivOfiYB85f35aD+V7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2776 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-24_11:2020-11-24,2020-11-24 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 bulkscore=0 suspectscore=0 malwarescore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 clxscore=1015 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011240137 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Nov 23, 2020, at 3:47 PM, Jiri Olsa wrote: [...] >=20 > I still need to review this deeply, but so far I'm getting this error: >=20 > # ./perf stat -b 40 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: elf: skipping unrecognized data section(9) .eh_frame > libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_= frame > libbpf: XXX is not found in vmlinux BTF > libbpf: failed to load object 'bpf_prog_profiler_bpf' > libbpf: failed to load BPF skeleton 'bpf_prog_profiler_bpf': -2 > libbpf: Can't get the 0th fd from program fentry_XXX: only -1 instances > libbpf: prog 'fentry_XXX': can't attach before loaded > libbpf: failed to auto-attach program 'fentry_XXX': -22 I cannot reproduce this. Is 40 a valid BPF program ID? Could you please sha= re=20 more information about it with "bpftool prog show id 40"? Thanks, Song=