linux-kernel - Re: [RFC 2/2] perf-stat: enable counting events for BPF programs

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Message-ID: <86F842B0-BF89-4418-BA2E-F93E50726A81@fb.com>
Date:   Tue, 24 Nov 2020 23:31:49 +0000
From:   Song Liu <songliubraving@...com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     open list <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        Peter Ziljstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>
Subject: Re: [RFC 2/2] perf-stat: enable counting events for BPF programs



> On Nov 23, 2020, at 3:47 PM, Jiri Olsa <jolsa@...hat.com> wrote:

[...]

> 
> I still need to review this deeply, but so far I'm getting this error:
> 
> 	# ./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 share 
more information about it with "bpftool prog show id 40"?

Thanks,
Song