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

Ian Rogers
2020-06-01T07:44:28Z

On Sun, May 24, 2020 at 3:42 PM Jiri Olsa <jolsa@kernel.org> 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@kernel.org>
> ---
> 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
>