linux-kernel - Re: [PATCH v2 0/5] perf test trace: Reduce test failures and make error messages verbose

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Message-ID: <CAH0uvojyKi6tN2RfEsG25fn8G5G3iz+pWqjprm9qYaD_sA+i_Q@mail.gmail.com>
Date: Thu, 29 May 2025 00:07:33 -0700
From: Howard Chu <howardchu95@...il.com>
To: Ian Rogers <irogers@...gle.com>
Cc: acme@...nel.org, mingo@...hat.com, namhyung@...nel.org, 
	mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org, 
	adrian.hunter@...el.com, peterz@...radead.org, kan.liang@...ux.intel.com, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] perf test trace: Reduce test failures and make
 error messages verbose

Hello Ian,

On Sun, May 18, 2025 at 3:18 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Sun, May 18, 2025 at 12:10 PM Howard Chu <howardchu95@...il.com> wrote:
> >
> > Currently, BTF tests fail constantly, this series fixes two major reasons
> > why they fail, and makes the error messages acquired when using '-vv'
> > more verbose, so when they fail, one can easily diagnose the problem.
> >
> > Before:
> >     $ sudo /tmp/perf test enum -vv
> >     107: perf trace enum augmentation tests:
> >     107: perf trace enum augmentation tests                              : Running
> >     --- start ---
> >     test child forked, pid 783533
> >     Checking if vmlinux exists
> >     Tracing syscall landlock_add_rule
> >     Tracing non-syscall tracepoint syscall
> >     ---- end(-1) ----
> >     107: perf trace enum augmentation tests                              : FAILED!
> >
> > After:
> >     $ sudo /tmp/perf test enum -vv
> >     107: perf trace enum augmentation tests:
> >     107: perf trace enum augmentation tests                              : Running
> >     --- start ---
> >     test child forked, pid 851658
> >     Checking if vmlinux exists
> >     Tracing syscall landlock_add_rule
> >     Tracing non-syscall tracepoint timer:hrtimer_setup,timer:hrtimer_start
> >     [tracepoint failure] Failed to trace tracepoint timer:hrtimer_setup,timer:hrtimer_start, output:
> >     event syntax error: 'timer:hrtimer_setup,timer:hrtimer_start'
> >                          \___ unknown tracepoint
> >
> >     Error:  File /sys/kernel/tracing//events/timer/hrtimer_setup not found.
> >     Hint:   Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
> >
> >     Run 'perf list' for a list of valid events
> >
> >      Usage: perf trace [<options>] [<command>]
> >         or: perf trace [<options>] -- <command> [<options>]
> >         or: perf trace record [<options>] [<command>]
> >         or: perf trace record [<options>] -- <command> [<options>]
> >
> >         -e, --event <event>   event/syscall selector. use 'perf list' to list available events---- end(-1) ----
> >     107: perf trace enum augmentation tests                              : FAILED!
> >
> > Changes in v2:
> > - Add an extra newline after error messages
> > - Rename the title of patch 3 to 'Stop tracing hrtimer_setup...'
> > - Take the debug diff for explanation out of patch 5 to make it apply
> >   normally
> > - Add base-commit in this cover letter
>
> Thanks Howard! I did some testing but see failures that may be
> pre-existing issues:

Again, thank you for spending time testing this series! It has been
some time... But hopefully this: [1] along with the BTF test v3: [2]
can resolve the issues.

[1]: https://lore.kernel.org/linux-perf-users/20250529065537.529937-1-howardchu95@gmail.com/T/#u
[2]: https://lore.kernel.org/linux-perf-users/20250528191148.89118-1-howardchu95@gmail.com/T/#t

Thanks,
Howard