linux-kernel - Re: [PATCH 10/10] perf tests: Add cache_miss

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Message-ID: <CAP-5=fXk6ZqWdXqVGtiKemn254wTOKW3m4UuwF1Qum+mZQhYPg@mail.gmail.com>
Date:   Fri, 26 Jun 2020 14:40:34 -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 10/10] perf tests: Add cache_miss_cycles to metric parse test

On Fri, Jun 26, 2020 at 12:48 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding test that compute metric with other metrics in it.
>
>   cache_miss_cycles = metric:dcache_miss_cpi + metric:icache_miss_cycles
>

This is really nice! Do we need to do anything in tests/pmu-events.c?
Presumably if a metric is referencing another metric the call to
expr__parse there will test the other metric is parseable. Just wanted
to sanity check.

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

> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/tests/parse-metric.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/tools/perf/tests/parse-metric.c b/tools/perf/tests/parse-metric.c
> index 8c48251425e1..feb97f7c90c8 100644
> --- a/tools/perf/tests/parse-metric.c
> +++ b/tools/perf/tests/parse-metric.c
> @@ -11,6 +11,8 @@
>  #include "debug.h"
>  #include "expr.h"
>  #include "stat.h"
> +#include <perf/cpumap.h>
> +#include <perf/evlist.h>
>
>  static struct pmu_event pme_test[] = {
>  {
> @@ -22,6 +24,18 @@ static struct pmu_event pme_test[] = {
>                           "( 1 + cpu_clk_unhalted.one_thread_active / cpu_clk_unhalted.ref_xclk ) )))",
>         .metric_name    = "Frontend_Bound_SMT",
>  },
> +{
> +       .metric_expr    = "l1d\\-loads\\-misses / inst_retired.any",
> +       .metric_name    = "dcache_miss_cpi",
> +},
> +{
> +       .metric_expr    = "l1i\\-loads\\-misses / inst_retired.any",
> +       .metric_name    = "icache_miss_cycles",
> +},
> +{
> +       .metric_expr    = "(metric:dcache_miss_cpi + metric:icache_miss_cycles)",
> +       .metric_name    = "cache_miss_cycles",
> +},
>  };
>
>  static struct pmu_events_map map = {
> @@ -162,9 +176,28 @@ static int test_frontend(void)
>         return 0;
>  }
>
> +static int test_cache_miss_cycles(void)
> +{
> +       double ratio;
> +       struct value vals[] = {
> +               { .event = "l1d-loads-misses",  .val = 300 },
> +               { .event = "l1i-loads-misses",  .val = 200 },
> +               { .event = "inst_retired.any",  .val = 400 },
> +               { 0 },
> +       };
> +
> +       TEST_ASSERT_VAL("failed to compute metric",
> +                       compute_metric("cache_miss_cycles", vals, &ratio) == 0);
> +
> +       TEST_ASSERT_VAL("cache_miss_cycles failed, wrong ratio",
> +                       ratio == 1.25);
> +       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);
>         return 0;
>  }
> --
> 2.25.4
>