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

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Message-ID: <Y2zeOZcNjRCnEAVZ@leoy-yangtze.lan>
Date:   Thu, 10 Nov 2022 19:20:28 +0800
From:   Leo Yan <leo.yan@...aro.org>
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>,
        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 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:

--- 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>

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

Thanks,
Leo