linux-kernel - Re: [PATCH v7 2/2] perf tests: Test for PMU alias

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Date:   Fri, 3 Sep 2021 08:40:25 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com, rickyman7@...il.com,
        john.garry@...wei.com
Subject: Re: [PATCH v7 2/2] perf tests: Test for PMU alias

Em Thu, Sep 02, 2021 at 02:59:55PM +0800, Jin Yao escreveu:
> A perf uncore PMU may have two PMU names, a real name and an alias
> name. Add one test case to verify the real name and alias name having
> the same effect.
> 
> Iterate the sysfs to get one event which has an alias and create
> evlist by adding two evsels. Evsel1 is created by event and evsel2
> is created by alias.
> 
> Test asserts:
> evsel1->core.attr.type == evsel2->core.attr.type
> evsel1->core.attr.config == evsel2->core.attr.config

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> ---
> v7:
>  - No change.
> 
> v6:
>  - No change.
> 
> v5:
>  - No change.
> 
> v4:
>  - Rebase to perf/core.
> 
> v3:
>  - Use fgets to read alias string from sysfs.
>  - Resource cleanup.
> 
> v2:
>  - New in v2.
> 
>  tools/perf/tests/parse-events.c | 92 +++++++++++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> index 8d4866739255..fd3556cc9ad4 100644
> --- a/tools/perf/tests/parse-events.c
> +++ b/tools/perf/tests/parse-events.c
> @@ -9,6 +9,7 @@
>  #include "pmu-hybrid.h"
>  #include <dirent.h>
>  #include <errno.h>
> +#include "fncache.h"
>  #include <sys/types.h>
>  #include <sys/stat.h>
>  #include <unistd.h>
> @@ -2194,9 +2195,91 @@ static int test_pmu_events(void)
>  	return ret;
>  }
>  
> +static bool test_alias(char **event, char **alias)
> +{
> +	char path[PATH_MAX];
> +	DIR *dir;
> +	struct dirent *dent;
> +	const char *sysfs = sysfs__mountpoint();
> +	char buf[128];
> +	FILE *file;
> +
> +	if (!sysfs)
> +		return false;
> +
> +	snprintf(path, PATH_MAX, "%s/bus/event_source/devices/", sysfs);
> +	dir = opendir(path);
> +	if (!dir)
> +		return false;
> +
> +	while ((dent = readdir(dir))) {
> +		if (!strcmp(dent->d_name, ".") ||
> +		    !strcmp(dent->d_name, ".."))
> +			continue;
> +
> +		snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/alias",
> +			 sysfs, dent->d_name);
> +
> +		if (!file_available(path))
> +			continue;
> +
> +		file = fopen(path, "r");
> +		if (!file)
> +			continue;
> +
> +		if (!fgets(buf, sizeof(buf), file)) {
> +			fclose(file);
> +			continue;
> +		}
> +
> +		/* Remove the last '\n' */
> +		buf[strlen(buf) - 1] = 0;
> +
> +		fclose(file);
> +		*event = strdup(dent->d_name);
> +		*alias = strdup(buf);
> +		closedir(dir);
> +
> +		if (*event == NULL || *alias == NULL) {
> +			free(*event);
> +			free(*alias);
> +			return false;
> +		}
> +
> +		return true;
> +	}
> +
> +	closedir(dir);
> +	return false;
> +}
> +
> +static int test__checkevent_pmu_events_alias(struct evlist *evlist)
> +{
> +	struct evsel *evsel1 = evlist__first(evlist);
> +	struct evsel *evsel2 = evlist__last(evlist);
> +
> +	TEST_ASSERT_VAL("wrong type", evsel1->core.attr.type == evsel2->core.attr.type);
> +	TEST_ASSERT_VAL("wrong config", evsel1->core.attr.config == evsel2->core.attr.config);
> +	return 0;
> +}
> +
> +static int test_pmu_events_alias(char *event, char *alias)
> +{
> +	struct evlist_test e = { .id = 0, };
> +	char name[2 * NAME_MAX + 20];
> +
> +	snprintf(name, sizeof(name), "%s/event=1/,%s/event=1/",
> +		 event, alias);
> +
> +	e.name  = name;
> +	e.check = test__checkevent_pmu_events_alias;
> +	return test_event(&e);
> +}
> +
>  int test__parse_events(struct test *test __maybe_unused, int subtest __maybe_unused)
>  {
>  	int ret1, ret2 = 0;
> +	char *event, *alias;
>  
>  #define TEST_EVENTS(tests)				\
>  do {							\
> @@ -2221,6 +2304,15 @@ do {							\
>  			return ret;
>  	}
>  
> +	if (test_alias(&event, &alias)) {
> +		int ret = test_pmu_events_alias(event, alias);
> +
> +		free(event);
> +		free(alias);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret1 = test_terms(test__terms, ARRAY_SIZE(test__terms));
>  	if (!ret2)
>  		ret2 = ret1;
> -- 
> 2.17.1

-- 

- Arnaldo