linux-kernel - Re: [PATCH 06/12] perf test: Replace arm callgraph fp test workload with leafloop

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Date:   Thu, 10 Nov 2022 09:45:22 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Leo Yan <leo.yan@...aro.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>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        German Gomez <german.gomez@....com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>
Subject: Re: [PATCH 06/12] perf test: Replace arm callgraph fp test workload
 with leafloop

Hi Leo,

On Thu, Nov 10, 2022 at 3:20 AM Leo Yan <leo.yan@...aro.org> wrote:
>
> Hi Namyung,
>
> On Wed, Nov 09, 2022 at 09:46:29AM -0800, Namhyung Kim wrote:
> > So that it can get rid of requirement of a compiler.
> >
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  .../perf/tests/shell/test_arm_callgraph_fp.sh | 30 +------------------
> >  1 file changed, 1 insertion(+), 29 deletions(-)
> >
> > diff --git a/tools/perf/tests/shell/test_arm_callgraph_fp.sh b/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> > index ec108d45d3c6..9d6d1b2d99c5 100755
> > --- a/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> > +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> > @@ -4,44 +4,16 @@
> >
> >  lscpu | grep -q "aarch64" || exit 2
> >
> > -if ! [ -x "$(command -v cc)" ]; then
> > -     echo "failed: no compiler, install gcc"
> > -     exit 2
> > -fi
> > -
> >  PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> > -TEST_PROGRAM_SOURCE=$(mktemp /tmp/test_program.XXXXX.c)
> > -TEST_PROGRAM=$(mktemp /tmp/test_program.XXXXX)
> > +TEST_PROGRAM="perf test -w leafloop"
> >
> >  cleanup_files()
> >  {
> >       rm -f $PERF_DATA
> > -     rm -f $TEST_PROGRAM_SOURCE
> > -     rm -f $TEST_PROGRAM
> >  }
> >
> >  trap cleanup_files exit term int
> >
> > -cat << EOF > $TEST_PROGRAM_SOURCE
> > -int a = 0;
> > -void leaf(void) {
> > -  for (;;)
> > -    a += a;
> > -}
> > -void parent(void) {
> > -  leaf();
> > -}
> > -int main(void) {
> > -  parent();
> > -  return 0;
> > -}
> > -EOF
> > -
> > -echo " + Compiling test program ($TEST_PROGRAM)..."
> > -
> > -CFLAGS="-g -O0 -fno-inline -fno-omit-frame-pointer"
> > -cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1
> > -
> >  # Add a 1 second delay to skip samples that are not in the leaf() function
> >  perf record -o $PERF_DATA --call-graph fp -e cycles//u -D 1000 --user-callchains -- $TEST_PROGRAM 2> /dev/null &
> >  PID=$!
>
> I need to append below changes, otherwise the test will fail on Arm64:

Thanks for the fix, will add it to v2.

>
> --- a/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh
> @@ -30,11 +30,11 @@ wait $PID
>  # program
>  #      728 leaf
>  #      753 parent
> -#      76c main
> +#      76c leafloop
>  # ...
>
>  perf script -i $PERF_DATA -F comm,ip,sym | head -n4
>  perf script -i $PERF_DATA -F comm,ip,sym | head -n4 | \
>         awk '{ if ($2 != "") sym[i++] = $2 } END { if (sym[0] != "leaf" ||
>                                                        sym[1] != "parent" ||
> -                                                      sym[2] != "main") exit 1 }'
> +                                                      sym[2] != "leafloop") exit 1 }'
>
> With appending above change, this patch looks good to me:
>
> Reviewed-by: Leo Yan <leo.yan@...aro.org>

Great, thanks a lot!
Namhyung


>
> German, James, would you have chance to review this change?
>
> Thanks,
> Leo