linux-kernel - Re: [PATCH v2] perf test: Workload test of metric and metricgroups

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Date:   Fri, 17 Sep 2021 12:17:58 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     "Paul A. Clarke" <pc@...ibm.com>,
        John Garry <john.garry@...wei.com>
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@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        eranian@...gle.com
Subject: Re: [PATCH v2] perf test: Workload test of metric and metricgroups

On Thu, Sep 16, 2021 at 5:04 AM Paul A. Clarke <pc@...ibm.com> wrote:
>
> On Wed, Sep 15, 2021 at 11:05:25PM -0700, Ian Rogers wrote:
> > Test every metric and metricgroup with 'true' as a workload.
>
> Good idea!  (However...)
>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/tests/shell/stat_all_metricgroups.sh | 12 ++++++++++++
> >  tools/perf/tests/shell/stat_all_metrics.sh      | 16 ++++++++++++++++
> >  2 files changed, 28 insertions(+)
> >  create mode 100755 tools/perf/tests/shell/stat_all_metricgroups.sh
> >  create mode 100755 tools/perf/tests/shell/stat_all_metrics.sh
> >
> > diff --git a/tools/perf/tests/shell/stat_all_metricgroups.sh b/tools/perf/tests/shell/stat_all_metricgroups.sh
> > new file mode 100755
> > index 000000000000..de24d374ce24
> > --- /dev/null
> > +++ b/tools/perf/tests/shell/stat_all_metricgroups.sh
> > @@ -0,0 +1,12 @@
> > +#!/bin/sh
> > +# perf all metricgroups test
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +set -e
> > +
> > +for m in $(perf list --raw-dump metricgroups); do
> > +  echo "Testing $m"
> > +  perf stat -M "$m" true
> > +done
> > +
> > +exit 0
>
> This always succeeds. Is that what you want?
> Maybe check the return code from "perf", at least?

The "set -e" above means that if the perf command fails then the test exits.

> > diff --git a/tools/perf/tests/shell/stat_all_metrics.sh b/tools/perf/tests/shell/stat_all_metrics.sh
> > new file mode 100755
> > index 000000000000..81b19ba27e68
> > --- /dev/null
> > +++ b/tools/perf/tests/shell/stat_all_metrics.sh
> > @@ -0,0 +1,16 @@
> > +#!/bin/sh
> > +# perf all metrics test
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +set -e
> > +
> > +for m in `perf list --raw-dump metrics`; do
> > +  echo "Testing $m"
> > +  result=$(perf stat -M "$m" true)
>
> I don't think this is doing what you want it to do, as it just captures the
> output of "true", which is always empty.
>
> > +  if [[ "$result" =~ "$m" ]]; then
>
> So this always fails to match, and you'll never fail here, either. :-)

Doh! Thanks for catching this!

> > +    echo "Metric not printed: $m"
> > +    exit 1
> > +  fi
> > +done
> > +
> > +exit 0
>
> You may want to redirect the output of the "perf" command to a temporary file,
> then grep within that.  And, you'll need to remove the file before running the
> perf command, because if it fails, it will leave any existing file untouched.

I fixed it by redirecting stderr.

Thanks!
Ian

> Thanks! :-)
>
> PC