linux-kernel - Re: [PATCH] perf arm-spe: Test memory samples

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Date:   Wed, 13 Apr 2022 18:17:18 +0100
From:   German Gomez <german.gomez@....com>
To:     Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf arm-spe: Test memory samples


On 13/04/2022 02:02, Leo Yan wrote:
> Add a new test to verify the Arm SPE synthesized memory samples with
> 'perf mem report' command.
>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Reviewed-by: German Gomez <german.gomez@....com>

Thanks for the patch.

There are some tests for perf_event_attr fields. We added one for SPE
recently [1], but it's not checking the sample_type attribute yet.

We could update it from our side and send another patch, to test the
DATA_SRC bit is not missing.

[1] https://lore.kernel.org/all/20220126160710.32983-1-german.gomez@arm.com/

Thanks,
German

> ---
>  tools/perf/tests/shell/test_arm_spe.sh | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/test_arm_spe.sh b/tools/perf/tests/shell/test_arm_spe.sh
> index e59044edc406..b36125e127eb 100755
> --- a/tools/perf/tests/shell/test_arm_spe.sh
> +++ b/tools/perf/tests/shell/test_arm_spe.sh
> @@ -62,6 +62,18 @@ perf_report_samples() {
>  		egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
>  }
>  
> +perf_mem_report_samples() {
> +	echo "Looking at perf.data file for reporting memory samples:"
> +
> +	# Below is an example of the memory samples reporting:
> +	#   20.71%    1696    27    L1 hit     [k] el0t_64_sync_handler    [kernel.kallsyms]    ...
> +	#   17.21%    1903    20    L1 hit     [k] el0t_64_sync            [kernel.kallsyms]    ...
> +	#    8.52%     897    21    L1 hit     [k] ksys_read               [kernel.kallsyms]    ...
> +	#    0.12%      16    17    L1 hit     [.] 0x0000000000004ce8      dd                   ...
> +	perf mem report --stdio -i ${perfdata} 2>&1 | \
> +		egrep " +[0-9]+\.[0-9]+% +[0-9]+ +[0-9]+ .* +$1 " > /dev/null 2>&1
> +}
> +
>  arm_spe_snapshot_test() {
>  	echo "Recording trace with snapshot mode $perfdata"
>  	perf record -o ${perfdata} -e arm_spe// -S \
> @@ -79,7 +91,8 @@ arm_spe_snapshot_test() {
>  	wait $PERFPID
>  
>  	perf_script_samples dd &&
> -	perf_report_samples dd
> +	perf_report_samples dd &&
> +	perf_mem_report_samples dd
>  
>  	err=$?
>  	arm_spe_report "SPE snapshot testing" $err