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

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Date:   Thu, 16 Sep 2021 07:04:34 -0500
From:   "Paul A. Clarke" <pc@...ibm.com>
To:     Ian Rogers <irogers@...gle.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 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?

> 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. :-)

> +    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.

Thanks! :-)

PC