linux-kernel - Re: [PATCH 2/2] perf test: Skip test_arm_callgraph

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Date: Tue, 23 Jan 2024 09:41:19 -0800
From: Ian Rogers <irogers@...gle.com>
To: James Clark <james.clark@....com>
Cc: linux-perf-users@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kajol Jain <kjain@...ux.ibm.com>, 
	Spoorthy S <spoorts2@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf test: Skip test_arm_callgraph_fp.sh if unwinding
 isn't built in

On Tue, Jan 23, 2024 at 8:39 AM James Clark <james.clark@....com> wrote:
>
> Even though this is a frame pointer unwind test, it's testing that a
> frame pointer stack can be augmented correctly with a partial
> Dwarf unwind. So add a feature check so that this test skips instead of
> fails if Dwarf unwinding isn't present.

Hi James,

Is there value in testing without the partial Dwarf unwind? Presumably
that is covered by the existing dwarf unwind test?
https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/tests/dwarf-unwind.c?h=perf-tools-next
If the issue is inlined functions I'm surprised addr2line isn't doing
the job properly. Is there an addr2line perf script issue here?

Thanks,
Ian

> Signed-off-by: James Clark <james.clark@....com>
> ---
>  tools/perf/tests/shell/test_arm_callgraph_fp.sh | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tools/perf/tests/shell/test_arm_callgraph_fp.sh b/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> index e342e6c8aa50..83b53591b1ea 100755
> --- a/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> @@ -8,6 +8,12 @@ shelldir=$(dirname "$0")
>
>  lscpu | grep -q "aarch64" || exit 2
>
> +if perf version --build-options | grep HAVE_DWARF_UNWIND_SUPPORT | grep -q OFF
> +then
> +  echo "Skipping, no dwarf unwind support"
> +  exit 2
> +fi
> +
>  skip_test_missing_symbol leafloop
>
>  PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> --
> 2.34.1
>