linux-kernel - Re: [PATCH v4 0/2] perf trace: Add more tests for BTF-augmented perf trace

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Message-ID: <CAH0uvoga29=0iF69A5uHN+nbB458LeW+WDWHNnoQV4msVm9zDQ@mail.gmail.com>
Date: Fri, 10 Jan 2025 16:52:08 -0800
From: Howard Chu <howardchu95@...il.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>, mark.rutland@....com, 
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org, irogers@...gle.com, 
	adrian.hunter@...el.com, kan.liang@...ux.intel.com, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/2] perf trace: Add more tests for BTF-augmented perf trace

Hello Arnaldo,

On Mon, Dec 23, 2024 at 11:40 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> On Mon, Dec 23, 2024 at 04:02:43PM -0300, Arnaldo Carvalho de Melo wrote:
> > On Mon, Dec 16, 2024 at 11:58:46AM -0800, Namhyung Kim wrote:
> > > On Sun, Dec 15, 2024 at 11:07:09AM -0800, Howard Chu wrote:
> > > > Changes in v4:
> > > >  - Use if -f to check the existence of vmlinux BTF, and exit if it
> > > >    doesn't, so trace_test_string will not overwrite $err, and keep
> > > >    running the test.
> > > >
> > > > Changes in v3:
> > > >  - Add vmlinux BTF check, and skip the tests if it doesn't exist
> > > >
> > > > v1, v2:
> > > >
> > > > The previous version of the perf trace BTF general augmentation tests
> > > > didn't pass Shellcheck (thanks to Arnaldo Carvalho de Melo
> > > > <acme@...nel.org> for pointing this out), this version uses bash instead
> > > > of POSIX shell to pass Shellcheck.
> > > >
> > > > This patch series also adds documentation for the new option
> > > > --force-btf, which is used in the tests.
> > > >
> > > > Link: https://lore.kernel.org/linux-perf-users/Zt9yiQq-n-W6I274@x1/
> > > >
> > > > Howard Chu (2):
> > > >   perf trace: Add tests for BTF general augmentation
> > > >   perf docs: Add documentation for --force-btf option
> > >
> > > Acked-by: Namhyung Kim <namhyung@...nel.org>
> >
> > Thanks, applied to perf-tools-next,
>
> It fails when running in parallel mode, sometimes:
>
> 109: perf trace BTF general tests                                    : FAILED!
>
> Then:
>
> root@...ber:~# perf stat --null -r 10 perf test "BTF general"
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : FAILED!
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : FAILED!
> 109: perf trace BTF general tests                                    : Ok
> 109: perf trace BTF general tests                                    : Ok
>
>  Performance counter stats for 'perf test BTF general' (10 runs):
>
>              2.148 +- 0.293 seconds time elapsed  ( +- 13.63% )
>
> root@...ber:~#
>
>
> So its not just when running in paralell, anyway, its merged, we can go
> on from what we got there.

It never fails on my machine, I think the reason is my machine is not
fully-loaded. Can you please run
```
perf stat --null -r 10 perf test -vv "BTF general"
```
And provide the output?

Thanks,
Howard
>
> - Arnaldo