linux-kernel - Re: [PATCH v1] perf test: Avoid system wide when not privileged

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Date:   Mon, 2 Oct 2023 22:09:47 -0700
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>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf test: Avoid system wide when not privileged

On Mon, Oct 2, 2023 at 9:47 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hi Ian,
>
> On Fri, Sep 29, 2023 at 11:02 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Switch the test program to sleep that makes more sense for system wide
> > events. Only enable system wide when root or not paranoid. This avoids
> > failures under some testing conditions like ARM cloud.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> While I'm ok with the change, I wonder why it doesn't have the same
> code structure as in the stat_all_metrics.sh which checks the actual result.
>
> Acked-by: Namhyung Kim <namhyung@...nel.org>

The metric group isn't printed when we print the metrics within it.
This could be changed.

Thanks,
Ian

> Thanks,
> Namhyung
>
> > ---
> >  tools/perf/tests/shell/stat_all_metricgroups.sh | 16 ++++++++++++++--
> >  1 file changed, 14 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/tests/shell/stat_all_metricgroups.sh b/tools/perf/tests/shell/stat_all_metricgroups.sh
> > index cb35e488809a..f3e305649e2c 100755
> > --- a/tools/perf/tests/shell/stat_all_metricgroups.sh
> > +++ b/tools/perf/tests/shell/stat_all_metricgroups.sh
> > @@ -4,9 +4,21 @@
> >
> >  set -e
> >
> > -for m in $(perf list --raw-dump metricgroups); do
> > +function ParanoidAndNotRoot()
> > +{
> > +  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
> > +}
> > +
> > +system_wide_flag="-a"
> > +if ParanoidAndNotRoot 0
> > +then
> > +  system_wide_flag=""
> > +fi
> > +
> > +for m in $(perf list --raw-dump metricgroups)
> > +do
> >    echo "Testing $m"
> > -  perf stat -M "$m" -a true
> > +  perf stat -M "$m" $system_wide_flag sleep 0.01
> >  done
> >
> >  exit 0
> > --
> > 2.42.0.582.g8ccd20d70d-goog
> >