linux-kernel - Re: [PATCH v2 1/3] perf-stat: introduce bperf, share hardware PMCs with BPF

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Date:   Fri, 19 Mar 2021 22:06:47 +0000
From:   Song Liu <songliubraving@...com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "Arnaldo Carvalho de Melo" <acme@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "jolsa@...nel.org" <jolsa@...nel.org>
Subject: Re: [PATCH v2 1/3] perf-stat: introduce bperf, share hardware PMCs
 with BPF



> On Mar 19, 2021, at 11:55 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> 
> On Fri, Mar 19, 2021 at 03:41:57PM -0300, Arnaldo Carvalho de Melo wrote:
> 
> SNIP
> 
>>  LD       /tmp/build/perf/util/bpf_skel/.tmp//bootstrap/libbpf/staticobjs/libbpf-in.o
>>  LINK     /tmp/build/perf/util/bpf_skel/.tmp//bootstrap/libbpf/libbpf.a
>>  LINK     /tmp/build/perf/util/bpf_skel/.tmp//bootstrap/bpftool
>>  GEN-SKEL /tmp/build/perf/util/bpf_skel/bpf_prog_profiler.skel.h
>>  GEN-SKEL /tmp/build/perf/util/bpf_skel/bperf_leader.skel.h
>>  GEN-SKEL /tmp/build/perf/util/bpf_skel/bperf_follower.skel.h
>> libbpf: map 'prev_readings': unexpected def kind var.
>> Error: failed to open BPF object file: Invalid argument
>> libbpf: map 'diff_readings': unexpected def kind var.
>> Error: failed to open BPF object file: Invalid argument
> 
> I'm getting clean build for the same options,
> could you please send the same output also with 'JOBS=1 V=1'
> 
> 
>> make[2]: *** [Makefile.perf:1029: /tmp/build/perf/util/bpf_skel/bperf_leader.skel.h] Error 255
>> make[2]: *** Waiting for unfinished jobs....
>> make[2]: *** [Makefile.perf:1029: /tmp/build/perf/util/bpf_skel/bperf_follower.skel.h] Error 255
>> make[1]: *** [Makefile.perf:236: sub-make] Error 2
>> make: *** [Makefile:110: install-bin] Error 2
>> make: Leaving directory '/home/acme/git/perf/tools/perf'
>> [acme@...co perf]$ clang -v
>> clang version 11.0.0 (https://github.com/llvm/llvm-project 67420f1b0e9c673ee638f2680fa83f468019004f)
>> Target: x86_64-unknown-linux-gnu
>> Thread model: posix
>> InstalledDir: /usr/local/bin
>> Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/10
>> Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/10
>> Candidate multilib: .;@m64
>> Candidate multilib: 32;@m32
>> Selected multilib: .;@m64
>> [acme@...co perf]$
>> 
> 
> I have:
> 
> [jolsa@...l-r440-01 linux-perf]$ clang --version
> clang version 11.0.0 (Fedora 11.0.0-2.fc33)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /usr/bin

I am not able to repro this error either. I tried two versions of clang:

clang version 11.0.0 (Red Hat 11.0.0-0.2.rc2.module_el8.4.0+533+50191577)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /bin

clang version 12.0.0 (https://github.com/llvm/llvm-project.git 07f1e1f44c87d1ee84caf13d6e5aa64eb7e1b068)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin

Thanks,
Song