linux-kernel - Re: [PATCH] perf test: Add parse-metric memory bandwidth testcase

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Date:   Wed, 3 Feb 2021 13:24:37 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linuxarm@...neuler.org
Subject: Re: [PATCH] perf test: Add parse-metric memory bandwidth testcase

Hello,

On Mon, Jan 25, 2021 at 9:52 PM John Garry <john.garry@...wei.com> wrote:
>
> Event duration_time in a metric expression requires special handling.
>
> Improve test coverage by including a metric whose expression includes
> duration_time. The actual metric is a copied from the L1D_Cache_Fill_BW
> metric on my broadwell machine.
>
> Signed-off-by: John Garry <john.garry@...wei.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
> Based on acme perf/core + "perf metricgroup: Fix for metrics containing duration_time"
>
> diff --git a/tools/perf/tests/parse-metric.c b/tools/perf/tests/parse-metric.c
> index ce7be37f0d88..6dc1db1626ad 100644
> --- a/tools/perf/tests/parse-metric.c
> +++ b/tools/perf/tests/parse-metric.c
> @@ -69,6 +69,10 @@ static struct pmu_event pme_test[] = {
>         .metric_expr    = "1/m3",
>         .metric_name    = "M3",
>  },
> +{
> +       .metric_expr    = "64 * l1d.replacement / 1000000000 / duration_time",
> +       .metric_name    = "L1D_Cache_Fill_BW",
> +},
>  {
>         .name   = NULL,
>  }
> @@ -107,6 +111,8 @@ static void load_runtime_stat(struct runtime_stat *st, struct evlist *evlist,
>         evlist__for_each_entry(evlist, evsel) {
>                 count = find_value(evsel->name, vals);
>                 perf_stat__update_shadow_stats(evsel, count, 0, st);
> +               if (!strcmp(evsel->name, "duration_time"))
> +                       update_stats(&walltime_nsecs_stats, count);
>         }
>  }
>
> @@ -321,6 +327,23 @@ static int test_recursion_fail(void)
>         return 0;
>  }
>
> +static int test_memory_bandwidth(void)
> +{
> +       double ratio;
> +       struct value vals[] = {
> +               { .event = "l1d.replacement", .val = 4000000 },
> +               { .event = "duration_time",  .val = 200000000 },
> +               { .event = NULL, },
> +       };
> +
> +       TEST_ASSERT_VAL("failed to compute metric",
> +                       compute_metric("L1D_Cache_Fill_BW", vals, &ratio) == 0);
> +       TEST_ASSERT_VAL("L1D_Cache_Fill_BW, wrong ratio",
> +                       1.28 == ratio);
> +
> +       return 0;
> +}
> +
>  static int test_metric_group(void)
>  {
>         double ratio1, ratio2;
> @@ -353,5 +376,6 @@ int test__parse_metric(struct test *test __maybe_unused, int subtest __maybe_unu
>         TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
>         TEST_ASSERT_VAL("recursion fail failed", test_recursion_fail() == 0);
>         TEST_ASSERT_VAL("test metric group", test_metric_group() == 0);
> +       TEST_ASSERT_VAL("Memory bandwidth", test_memory_bandwidth() == 0);
>         return 0;
>  }
> --
> 2.26.2
>