linux-kernel - Re: [PATCH] perf test: Do not fail Intel-PT misc test w/o libpython

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Date:   Thu, 20 Oct 2022 16:44:12 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, Ammy Yi <ammy.yi@...el.com>
Subject: Re: [PATCH] perf test: Do not fail Intel-PT misc test w/o libpython

On Thu, Oct 20, 2022 at 12:29 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> The virtuall LBR test uses a python script to check the max size of
> branch stack in the Intel-PT generated LBR.  But it didn't check whether
> python scripting is available (as it's optional).
>
> Let's skip the test if the python support is not available.
>
> Fixes: f77811a0f625 ("perf test: test_intel_pt.sh: Add 9 tests")
> Cc: Ammy Yi <ammy.yi@...el.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/tests/shell/test_intel_pt.sh | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tools/perf/tests/shell/test_intel_pt.sh b/tools/perf/tests/shell/test_intel_pt.sh
> index 4c0aabbe33bd..e66b7d977462 100755
> --- a/tools/perf/tests/shell/test_intel_pt.sh
> +++ b/tools/perf/tests/shell/test_intel_pt.sh
> @@ -526,6 +526,12 @@ test_kernel_trace()
>  test_virtual_lbr()
>  {
>         echo "--- Test virtual LBR ---"
> +       # Check if python script is supported
> +       libpython=$(ldd $(which perf) | grep -c python)
> +       if [ "${libpython}" != "1" ] ; then

Perhaps use -vv (taking care not to match "on" against "python"):

if perf -vv|grep libpython|grep -q " on"; then

Thanks,
Ian

> +               echo "SKIP: python scripting is not supported"
> +               return 2
> +       fi
>
>         # Python script to determine the maximum size of branch stacks
>         cat << "_end_of_file_" > "${maxbrstack}"
> --
> 2.38.0.135.g90850a2211-goog
>