linux-kernel - Re: [PATCH 4/4] perf test: Make stat bpf counters test more robust

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Date:   Thu, 17 Jun 2021 16:21:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH 4/4] perf test: Make stat bpf counters test more robust

Em Thu, Jun 17, 2021 at 11:42:16AM -0700, Ian Rogers escreveu:
> If the test is run on a hypervisor then the cycles event may not be
> counted, skip the test in this situation. Fail the test if cycles are
> not counted in the subsequent bpf counter run.

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/shell/stat_bpf_counters.sh | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/perf/tests/shell/stat_bpf_counters.sh b/tools/perf/tests/shell/stat_bpf_counters.sh
> index 81d61b6e1208..2aed20dc2262 100755
> --- a/tools/perf/tests/shell/stat_bpf_counters.sh
> +++ b/tools/perf/tests/shell/stat_bpf_counters.sh
> @@ -31,7 +31,15 @@ if ! perf stat --bpf-counters true > /dev/null 2>&1; then
>  fi
>  
>  base_cycles=$(perf stat --no-big-num -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')
> +if [ "$base_cycles" == "<not" ]; then
> +	echo "Skipping: cycles event not counted"
> +	exit 2
> +fi
>  bpf_cycles=$(perf stat --no-big-num --bpf-counters -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')
> +if [ "$bpf_cycles" == "<not" ]; then
> +	echo "Failed: cycles not counted with --bpf-counters"
> +	exit 1
> +fi
>  
>  compare_number $base_cycles $bpf_cycles
>  exit 0
> -- 
> 2.32.0.288.g62a8d224e6-goog
> 

-- 

- Arnaldo