linux-kernel - Re: [PATCH v1] perf test expr: Fix system_tsc

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Message-ID: <CAP-5=fV6s0=X-+8i2+1O_ZKERTL8+S9S-nyZC8rJPNU_nQpbyg@mail.gmail.com>
Date: Wed, 4 Dec 2024 23:09:50 -0800
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <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>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	James Clark <james.clark@...aro.org>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
	akanksha@...ux.ibm.com, maddy@...ux.ibm.com, atrajeev@...ux.vnet.ibm.com, 
	kjain@...ux.ibm.com, disgoel@...ux.vnet.ibm.com, hbathini@...ux.ibm.com
Subject: Re: [PATCH v1] perf test expr: Fix system_tsc_freq for only x86

On Wed, Dec 4, 2024 at 10:33 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Wed, Dec 4, 2024 at 9:47 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > Hi Ian,
> >
> > On Wed, Dec 04, 2024 at 06:23:05PM -0800, Ian Rogers wrote:
> > > The refactoring of tool PMU events to have a PMU then adding the expr
> > > literals to the tool PMU made it so that the literal system_tsc_freq
> > > was only supported on x86. Update the test expectations to match -
> > > namely the parsing is x86 specific and only yields a non-zero value on
> > > Intel.
> > >
> > > Fixes: 609aa2667f67 ("perf tool_pmu: Switch to standard pmu functions and json descriptions")
> > > Reported-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> > > Closes: https://lore.kernel.org/linux-perf-users/20241022140156.98854-1-atrajeev@linux.vnet.ibm.com/
> > > Co-developed-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> >
> > It failed on my VM.
> >
> >   root@...64-vm:~/build# ./perf test -v 7
> >   --- start ---
> >   test child forked, pid 2096
> >   Using CPUID 0x00000000000f0510
> >   division by zero
> >   syntax error
> >   Unrecognized literal '#system_tsc_freq'FAILED tests/expr.c:253 #system_tsc_freq == 0
> >   ---- end(-1) ----
> >     7: Simple expression parser                                        : FAILED!
>
> I'll need to check this. The test is looking for parsing failures, so
> it's confusing to me expr__parse is returning 0. I was testing on x86
> but disabling the literal in the tool PMU.

Hmm.. perhaps you had a similar issue to me and that b4 silently
failed as git user.email/user.name weren't configured? When I test on
a raspberry pi 5:
```
$ uname -a
Linux raspberrypi 6.6.51+rpt-rpi-2712 #1 SMP PREEMPT Debian
1:6.6.51-1+rpt3 (2024-10-08) aarch64 GNU/Linux
$ git log -1 --oneline
94733a0e50fd (HEAD -> ptn-expr-test) perf test expr: Fix
system_tsc_freq for only x86
$ /tmp/perf/perf test expr -v
Couldn't bump rlimit(MEMLOCK), failures may take place when creating
BPF maps, etc
  7: Simple expression parser                                        : Ok
```

Thanks,
Ian