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

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Message-ID: <20201125164236.GM2164284@krava>
Date:   Wed, 25 Nov 2020 17:42:36 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...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 Tue, Nov 24, 2020 at 11:31:49PM +0000, Song Liu wrote:
> 
> 
> > 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"?

it was bpftrace kfunc program, I'll try again and get back with
more details if there's still the problem

jirka