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

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Date:   Fri, 21 Oct 2022 08:22:25 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.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 20/10/22 22:29, Namhyung Kim 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)

'which' might not be installed.  Don't about 'ldd'.

Maybe 'perf version --build-options' can be used instead e.g.

$ perf version --build-options | grep -i libpython | grep -vi off
             libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT

> +	if [ "${libpython}" != "1" ] ; then
> +		echo "SKIP: python scripting is not supported"
> +		return 2
> +	fi
>  
>  	# Python script to determine the maximum size of branch stacks
>  	cat << "_end_of_file_" > "${maxbrstack}"