Re: [PATCH 06/14] perf tests: Add another pmu-events tests

[Ian Rogers]

On Sun, May 24, 2020 at 3:42 PM Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
>
> The test goes through all metrics compiled for arch
> within pmu events and try to parse them.
>
> The test also defines its own list of metrics and
> tries to parse them. It's handy for developing.
>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> ---
>  tools/perf/tests/pmu-events.c | 120 ++++++++++++++++++++++++++++++++++
>  1 file changed, 120 insertions(+)
>
> diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
> index ab64b4a4e284..f100df025440 100644
> --- a/tools/perf/tests/pmu-events.c
> +++ b/tools/perf/tests/pmu-events.c
> @@ -490,6 +490,122 @@ static int test_parsing(void)
>         return ret == 0 ? TEST_OK : TEST_SKIP;
>  }
>
> +struct test_metric {
> +       const char *str;
> +};
> +
> +static struct test_metric metrics[] = {
> +       { "(unc_p_power_state_occupancy.cores_c0 / unc_p_clockticks) * 100." },
> +       { "imx8_ddr0@read\\-cycles@ * 4 * 4", },
> +       { "imx8_ddr0@axid\\-read\\,axi_mask\\=0xffff\\,axi_id\\=0x0000@ * 4", },
> +       { "(cstate_pkg@c2\\-residency@ / msr@tsc@) * 100", },
> +       { "(imx8_ddr0@read\\-cycles@ + imx8_ddr0@write\\-cycles@)", },
> +};
> +
> +static int check_id(const char *id)
> +{
> +       struct parse_events_error error;
> +       struct evlist *evlist;
> +       int ret;
> +
> +       /* Numbers are always valid. */
> +       if (is_number(id))
> +               return 0;
> +
> +       evlist = evlist__new();
> +       if (!evlist)
> +               return -1;
> +
> +       memset(&error, 0, sizeof(error));
> +       ret = parse_events_fake(evlist, id, &error);
> +       if (ret) {
> +               pr_debug("str        : %s\n", error.str);
> +               pr_debug("help       : %s\n", error.help);
> +               pr_debug("first_str  : %s\n", error.first_str);
> +               pr_debug("first_help : %s\n", error.first_help);
> +       }
> +
> +       evlist__delete(evlist);
> +       free(error.str);
> +       free(error.help);
> +       free(error.first_str);
> +       free(error.first_help);
> +       return ret;
> +}

This is quite similar to check_parse_id, fold them together?

> +
> +static int metric_parse_fake(const char *str)
> +{
> +       struct expr_parse_ctx ctx;
> +       struct hashmap_entry *cur;
> +       double result;
> +       int ret = -1;
> +       size_t bkt;
> +       int i;
> +
> +       pr_debug("parsing '%s'\n", str);
> +
> +       expr__ctx_init(&ctx);
> +       if (expr__find_other(str, NULL, &ctx, 0) < 0) {
> +               pr_err("expr__find_other failed\n");
> +               return -1;
> +       }
> +
> +       i = 1;
> +       hashmap__for_each_entry((&ctx.ids), cur, bkt)
> +               expr__add_id(&ctx, strdup(cur->key), i++);

It might make sense to share the code here with that in test_parsing.
This initialization of ids is commented there and it is a bit special.

Thanks,
Ian

> +
> +       hashmap__for_each_entry((&ctx.ids), cur, bkt) {
> +               if (check_id(cur->key)) {
> +                       pr_err("check_id failed\n");
> +                       goto out;
> +               }
> +       }
> +
> +       if (!expr__parse(&result, &ctx, str, 1))
> +               ret = 0;
> +       else
> +               pr_err("expr__parse failed\n");
> +
> +out:
> +       expr__ctx_clear(&ctx);
> +       return ret;
> +
> +}
> +
> +static int test_parsing_fake(void)
> +{
> +       struct pmu_events_map *map;
> +       struct pmu_event *pe;
> +       unsigned int i, j;
> +       int err = 0;
> +
> +       for (i = 0; !err && i < ARRAY_SIZE(metrics); i++)
> +               err = metric_parse_fake(metrics[i].str);
> +
> +       if (err)
> +               return err;
> +
> +       i = 0;
> +       for (;;) {
> +               map = &pmu_events_map[i++];
> +               if (!map->table)
> +                       break;
> +               j = 0;
> +               for (;;) {
> +                       pe = &map->table[j++];
> +                       if (!pe->name && !pe->metric_group && !pe->metric_name)
> +                               break;
> +                       if (!pe->metric_expr)
> +                               continue;
> +                       err = metric_parse_fake(pe->metric_expr);
> +                       if (err)
> +                               return err;
> +               }
> +       }
> +
> +       return 0;
> +}
> +
>  static const struct {
>         int (*func)(void);
>         const char *desc;
> @@ -506,6 +622,10 @@ static const struct {
>                 .func = test_parsing,
>                 .desc = "Parsing of PMU event table metrics",
>         },
> +       {
> +               .func = test_parsing_fake,
> +               .desc = "Parsing of PMU event table metrics with fake PMUs",
> +       },
>  };
>
>  const char *test__pmu_events_subtest_get_desc(int subtest)
> --
> 2.25.4
>