linux-kernel - Re: [PATCH 15/18] perf metric: Add DCache

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Message-ID: <CAP-5=fV_Hnhcc1Z=xvjkKzjtz+xkUw+q1DG0ov2eOhmagD50PQ@mail.gmail.com>
Date:   Wed, 15 Jul 2020 10:01:36 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 15/18] perf metric: Add DCache_L2 to metric parse test

On Sun, Jul 12, 2020 at 6:27 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding test that compute DCache_L2 metrics with other related metrics in it.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

This feels familiar :-)

Acked-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian


> ---
>  tools/perf/tests/parse-metric.c | 71 +++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>
> diff --git a/tools/perf/tests/parse-metric.c b/tools/perf/tests/parse-metric.c
> index 28f33893338b..b50e2a3f3b73 100644
> --- a/tools/perf/tests/parse-metric.c
> +++ b/tools/perf/tests/parse-metric.c
> @@ -36,6 +36,27 @@ static struct pmu_event pme_test[] = {
>         .metric_expr    = "(dcache_miss_cpi + icache_miss_cycles)",
>         .metric_name    = "cache_miss_cycles",
>  },
> +{
> +       .metric_expr    = "L2_RQSTS.DEMAND_DATA_RD_HIT + L2_RQSTS.PF_HIT + L2_RQSTS.RFO_HIT",
> +       .metric_name    = "DCache_L2_All_Hits",
> +},
> +{
> +       .metric_expr    = "max(L2_RQSTS.ALL_DEMAND_DATA_RD - L2_RQSTS.DEMAND_DATA_RD_HIT, 0) + "
> +                         "L2_RQSTS.PF_MISS + L2_RQSTS.RFO_MISS",
> +       .metric_name    = "DCache_L2_All_Miss",
> +},
> +{
> +       .metric_expr    = "DCache_L2_All_Hits + DCache_L2_All_Miss",
> +       .metric_name    = "DCache_L2_All",
> +},
> +{
> +       .metric_expr    = "d_ratio(DCache_L2_All_Hits, DCache_L2_All)",
> +       .metric_name    = "DCache_L2_Hits",
> +},
> +{
> +       .metric_expr    = "d_ratio(DCache_L2_All_Miss, DCache_L2_All)",
> +       .metric_name    = "DCache_L2_Misses",
> +},
>  };
>
>  static struct pmu_events_map map = {
> @@ -194,10 +215,60 @@ static int test_cache_miss_cycles(void)
>         return 0;
>  }
>
> +
> +/*
> + * DCache_L2_All_Hits = L2_RQSTS.DEMAND_DATA_RD_HIT + L2_RQSTS.PF_HIT + L2_RQSTS.RFO_HI
> + * DCache_L2_All_Miss = MAX(L2_RQSTS.ALL_DEMAND_DATA_RD - L2_RQSTS.DEMAND_DATA_RD_HIT, 0) +
> + *                      L2_RQSTS.PF_MISS + L2_RQSTS.RFO_MISS
> + * DCache_L2_All      = DCache_L2_All_Hits + DCache_L2_All_Miss
> + * DCache_L2_Hits     = d_ratio(DCache_L2_All_Hits, DCache_L2_All)
> + * DCache_L2_Misses   = d_ratio(DCache_L2_All_Miss, DCache_L2_All)
> + *
> + * L2_RQSTS.DEMAND_DATA_RD_HIT = 100
> + * L2_RQSTS.PF_HIT             = 200
> + * L2_RQSTS.RFO_HI             = 300
> + * L2_RQSTS.ALL_DEMAND_DATA_RD = 400
> + * L2_RQSTS.PF_MISS            = 500
> + * L2_RQSTS.RFO_MISS           = 600
> + *
> + * DCache_L2_All_Hits = 600
> + * DCache_L2_All_Miss = MAX(400 - 100, 0) + 500 + 600 = 1400
> + * DCache_L2_All      = 600 + 1400  = 2000
> + * DCache_L2_Hits     = 600 / 2000  = 0.3
> + * DCache_L2_Misses   = 1400 / 2000 = 0.7
> + */
> +static int test_dcache_l2(void)
> +{
> +       double ratio;
> +       struct value vals[] = {
> +               { .event = "L2_RQSTS.DEMAND_DATA_RD_HIT", .val = 100 },
> +               { .event = "L2_RQSTS.PF_HIT",             .val = 200 },
> +               { .event = "L2_RQSTS.RFO_HIT",            .val = 300 },
> +               { .event = "L2_RQSTS.ALL_DEMAND_DATA_RD", .val = 400 },
> +               { .event = "L2_RQSTS.PF_MISS",            .val = 500 },
> +               { .event = "L2_RQSTS.RFO_MISS",           .val = 600 },
> +               { 0 },
> +       };
> +
> +       TEST_ASSERT_VAL("failed to compute metric",
> +                       compute_metric("DCache_L2_Hits", vals, &ratio) == 0);
> +
> +       TEST_ASSERT_VAL("DCache_L2_Hits failed, wrong ratio",
> +                       ratio == 0.3);
> +
> +       TEST_ASSERT_VAL("failed to compute metric",
> +                       compute_metric("DCache_L2_Misses", vals, &ratio) == 0);
> +
> +       TEST_ASSERT_VAL("DCache_L2_Misses failed, wrong ratio",
> +                       ratio == 0.7);
> +       return 0;
> +}
> +
>  int test__parse_metric(struct test *test __maybe_unused, int subtest __maybe_unused)
>  {
>         TEST_ASSERT_VAL("IPC failed", test_ipc() == 0);
>         TEST_ASSERT_VAL("frontend failed", test_frontend() == 0);
>         TEST_ASSERT_VAL("cache_miss_cycles failed", test_cache_miss_cycles() == 0);
> +       TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
>         return 0;
>  }
> --
> 2.25.4
>