On Fri, Aug 25, 2023 at 9:41 AM Namhyung Kim namhyung@kernel.org wrote:

As of now, bpf counters (bperf) don't support event groups. But the default perf stat includes topdown metrics if supported (on recent Intel machines) which require groups. That makes perf stat exiting.

$ sudo perf stat --bpf-counter true bpf managed perf events do not yet support groups.

Actually the test explicitly uses cycles event only, but it missed to pass the option when it checks the availability of the command.

Fixes: 2c0cb9f56020d ("perf test: Add a shell test for 'perf stat --bpf-counters' new option") Cc: stable@vger.kernel.org Cc: Song Liu song@kernel.org Signed-off-by: Namhyung Kim namhyung@kernel.org

Reviewed-by: Song Liu song@kernel.org

Thanks! Song

---

tools/perf/tests/shell/stat_bpf_counters.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/shell/stat_bpf_counters.sh b/tools/perf/tests/shell/stat_bpf_counters.sh index 513cd1e58e0e..a87bb2814b4c 100755 --- a/tools/perf/tests/shell/stat_bpf_counters.sh +++ b/tools/perf/tests/shell/stat_bpf_counters.sh @@ -22,10 +22,10 @@ compare_number() }

# skip if --bpf-counters is not supported -if ! perf stat --bpf-counters true > /dev/null 2>&1; then +if ! perf stat -e cycles --bpf-counters true > /dev/null 2>&1; then if [ "$1" = "-v" ]; then echo "Skipping: --bpf-counters not supported"

•           perf --no-pager stat --bpf-counters true || true
  

•           perf --no-pager stat -e cycles --bpf-counters true || true
    fi
    exit 2
  

fi

2.42.0.rc1.204.g551eb34607-goog