Re: [PATCH v1 12/40] perf test: Roundtrip name, don't assume 1 event per name

["Liang, Kan" <kan.liang@linux.intel.com>]

On 2023-04-26 3:00 a.m., Ian Rogers wrote:
> Opening hardware names and a legacy cache event on a hybrid PMU opens
> it on each PMU. Parsing and checking indexes fails, as the parsed
> index is double the expected. Avoid checking the index by just
> comparing the names immediately after the parse.
> 
> This change removes hard coded hybrid logic and removes assumptions
> about the expansion of an event. On hybrid the PMUs may or may not
> support an event and so using a distance isn't a consistent solution.
> 
> Signed-off-by: Ian Rogers <irogers@google.com>

Run the test on Cascade Lake and Alder Lake. It looks good.

Tested-by: Kan Liang <kan.liang@linux.intel.com>

Thanks,
Kan
> ---
>  tools/perf/tests/evsel-roundtrip-name.c | 119 ++++++++++--------------
>  1 file changed, 49 insertions(+), 70 deletions(-)
> 
> diff --git a/tools/perf/tests/evsel-roundtrip-name.c b/tools/perf/tests/evsel-roundtrip-name.c
> index e94fed901992..15ff86f9da0b 100644
> --- a/tools/perf/tests/evsel-roundtrip-name.c
> +++ b/tools/perf/tests/evsel-roundtrip-name.c
> @@ -4,114 +4,93 @@
>  #include "parse-events.h"
>  #include "tests.h"
>  #include "debug.h"
> -#include "pmu.h"
> -#include "pmu-hybrid.h"
> -#include <errno.h>
>  #include <linux/kernel.h>
>  
>  static int perf_evsel__roundtrip_cache_name_test(void)
>  {
> -	char name[128];
> -	int type, op, err = 0, ret = 0, i, idx;
> -	struct evsel *evsel;
> -	struct evlist *evlist = evlist__new();
> +	int ret = TEST_OK;
>  
> -        if (evlist == NULL)
> -                return -ENOMEM;
> -
> -	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
> -		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
> +	for (int type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
> +		for (int op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
>  			/* skip invalid cache type */
>  			if (!evsel__is_cache_op_valid(type, op))
>  				continue;
>  
> -			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
> -				__evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
> -				err = parse_event(evlist, name);
> -				if (err)
> -					ret = err;
> -			}
> -		}
> -	}
> -
> -	idx = 0;
> -	evsel = evlist__first(evlist);
> +			for (int res = 0; res < PERF_COUNT_HW_CACHE_RESULT_MAX; res++) {
> +				char name[128];
> +				struct evlist *evlist = evlist__new();
> +				struct evsel *evsel;
> +				int err;
>  
> -	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
> -		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
> -			/* skip invalid cache type */
> -			if (!evsel__is_cache_op_valid(type, op))
> -				continue;
> +				if (evlist == NULL) {
> +					pr_debug("Failed to alloc evlist");
> +					return TEST_FAIL;
> +				}
> +				__evsel__hw_cache_type_op_res_name(type, op, res,
> +								name, sizeof(name));
>  
> -			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
> -				__evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
> -				if (evsel->core.idx != idx)
> +				err = parse_event(evlist, name);
> +				if (err) {
> +					pr_debug("Failure to parse cache event '%s' possibly as PMUs don't support it",
> +						name);
> +					evlist__delete(evlist);
>  					continue;
> -
> -				++idx;
> -
> -				if (strcmp(evsel__name(evsel), name)) {
> -					pr_debug("%s != %s\n", evsel__name(evsel), name);
> -					ret = -1;
>  				}
> -
> -				evsel = evsel__next(evsel);
> +				evlist__for_each_entry(evlist, evsel) {
> +					if (strcmp(evsel__name(evsel), name)) {
> +						pr_debug("%s != %s\n", evsel__name(evsel), name);
> +						ret = TEST_FAIL;
> +					}
> +				}
> +				evlist__delete(evlist);
>  			}
>  		}
>  	}
> -
> -	evlist__delete(evlist);
>  	return ret;
>  }
>  
> -static int __perf_evsel__name_array_test(const char *const names[], int nr_names,
> -					 int distance)
> +static int perf_evsel__name_array_test(const char *const names[], int nr_names)
>  {
> -	int i, err;
> -	struct evsel *evsel;
> -	struct evlist *evlist = evlist__new();
> +	int ret = TEST_OK;
>  
> -        if (evlist == NULL)
> -                return -ENOMEM;
> +	for (int i = 0; i < nr_names; ++i) {
> +		struct evlist *evlist = evlist__new();
> +		struct evsel *evsel;
> +		int err;
>  
> -	for (i = 0; i < nr_names; ++i) {
> +		if (evlist == NULL) {
> +			pr_debug("Failed to alloc evlist");
> +			return TEST_FAIL;
> +		}
>  		err = parse_event(evlist, names[i]);
>  		if (err) {
>  			pr_debug("failed to parse event '%s', err %d\n",
>  				 names[i], err);
> -			goto out_delete_evlist;
> +			evlist__delete(evlist);
> +			ret = TEST_FAIL;
> +			continue;
>  		}
> -	}
> -
> -	err = 0;
> -	evlist__for_each_entry(evlist, evsel) {
> -		if (strcmp(evsel__name(evsel), names[evsel->core.idx / distance])) {
> -			--err;
> -			pr_debug("%s != %s\n", evsel__name(evsel), names[evsel->core.idx / distance]);
> +		evlist__for_each_entry(evlist, evsel) {
> +			if (strcmp(evsel__name(evsel), names[i])) {
> +				pr_debug("%s != %s\n", evsel__name(evsel), names[i]);
> +				ret = TEST_FAIL;
> +			}
>  		}
> +		evlist__delete(evlist);
>  	}
> -
> -out_delete_evlist:
> -	evlist__delete(evlist);
> -	return err;
> +	return ret;
>  }
>  
> -#define perf_evsel__name_array_test(names, distance) \
> -	__perf_evsel__name_array_test(names, ARRAY_SIZE(names), distance)
> -
>  static int test__perf_evsel__roundtrip_name_test(struct test_suite *test __maybe_unused,
>  						 int subtest __maybe_unused)
>  {
> -	int err = 0, ret = 0;
> -
> -	if (perf_pmu__has_hybrid() && perf_pmu__hybrid_mounted("cpu_atom"))
> -		return perf_evsel__name_array_test(evsel__hw_names, 2);
> +	int err = 0, ret = TEST_OK;
>  
> -	err = perf_evsel__name_array_test(evsel__hw_names, 1);
> +	err = perf_evsel__name_array_test(evsel__hw_names, PERF_COUNT_HW_MAX);
>  	if (err)
>  		ret = err;
>  
> -	err = __perf_evsel__name_array_test(evsel__sw_names, PERF_COUNT_SW_DUMMY + 1, 1);
> +	err = perf_evsel__name_array_test(evsel__sw_names, PERF_COUNT_SW_DUMMY + 1);
>  	if (err)
>  		ret = err;
>