linux-kernel - Re: [PATCH] perf test: Do not compare overheads in the zstd comp test

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Date:   Thu, 12 Aug 2021 17:09:20 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        James Clark <james.clark@....com>,
        Thomas Richter <tmricht@...ux.ibm.com>
Subject: Re: [PATCH] perf test: Do not compare overheads in the zstd comp test

On Thu, Aug 12, 2021 at 4:57 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The overhead can vary on each run so it'd make the test failed
> sometimes.  Also order of hist entry can change.
>
> Use perf report -F option to omit the overhead field and sort the
> result alphabetically.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/tests/shell/record+zstd_comp_decomp.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/tests/shell/record+zstd_comp_decomp.sh b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> index 045723b3d992..8a168cf8bacc 100755
> --- a/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> +++ b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
> @@ -25,8 +25,8 @@ check_compressed_stats() {
>
>  check_compressed_output() {
>         $perf_tool inject -i $trace_file -o $trace_file.decomp &&
> -       $perf_tool report -i $trace_file --stdio | head -n -3 > $trace_file.comp.output &&
> -       $perf_tool report -i $trace_file.decomp --stdio | head -n -3 > $trace_file.decomp.output &&
> +       $perf_tool report -i $trace_file --stdio -F comm,dso,sym | head -n -3 > $trace_file.comp.output &&
> +       $perf_tool report -i $trace_file.decomp --stdio -F comm,dso,sym | head -n -3 > $trace_file.decomp.output &&
>         diff $trace_file.comp.output $trace_file.decomp.output
>  }
>
> --
> 2.33.0.rc1.237.g0d66db33f3-goog
>