linux-kernel - Re: [PATCH v3 12/46] perf test: Test more sysfs events

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Date:   Tue, 2 May 2023 08:16:29 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Ravi Bangoria <ravi.bangoria@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ahmad Yasin <ahmad.yasin@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Weilin Wang <weilin.wang@...el.com>,
        Edward Baker <edward.baker@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fischer <florian.fischer@...q.space>,
        Rob Herring <robh@...nel.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Leo Yan <leo.yan@...aro.org>,
        Yang Jihong <yangjihong1@...wei.com>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Kang Minchul <tegongkang@...il.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 12/46] perf test: Test more sysfs events

On Tue, May 2, 2023 at 3:27 AM Ravi Bangoria <ravi.bangoria@....com> wrote:
>
> > @@ -2225,74 +2226,82 @@ static int test_pmu(void)
> >
> >  static int test__pmu_events(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
> >  {
> > -     struct stat st;
> > -     char path[PATH_MAX];
> > -     struct dirent *ent;
> > -     DIR *dir;
> > -     int ret;
> > +     struct perf_pmu *pmu;
> > +     int ret = TEST_OK;
> >
> > -     if (!test_pmu())
> > -             return TEST_SKIP;
> > +     perf_pmus__for_each_pmu(pmu) {
>
> 'pmus' list might be empty and, if so, we need to fill it first with:
>
>         if (list_empty(&pmus))
>                 perf_pmu__scan(NULL);
>
> before iterating over it. Other option is to add this code to
> perf_pmus__for_each_pmu() macro itself.
>
> With that, the test fails for me:
>
> $ sudo ./perf test 6
>   6: Parse event definition strings                                  :
>   6.1: Test event parsing                                            : Ok
>   6.2: Test parsing of "hybrid" CPU events                           : Skip (not hybrid)
>   6.3: Parsing of all PMU events from sysfs                          : FAILED!
>
> > +             struct stat st;
> > +             char path[PATH_MAX];
> > +             struct dirent *ent;
> > +             DIR *dir;
> > +             int err;
> >
> > -     snprintf(path, PATH_MAX, "%s/bus/event_source/devices/cpu/events/",
> > -              sysfs__mountpoint());
> > +             snprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/events/",
> > +                     sysfs__mountpoint(), pmu->name);
> >
> > -     ret = stat(path, &st);
> > -     if (ret) {
> > -             pr_debug("omitting PMU cpu events tests: %s\n", path);
> > -             return TEST_OK;
> > -     }
> > +             err = stat(path, &st);
> > +             if (err) {
> > +                     pr_debug("skipping PMU %s events tests: %s\n", pmu->name, path);
> > +                     ret = combine_test_results(ret, TEST_SKIP);
>
> combine_test_results(ret, TEST_OK); probably? Since many pmus don't expose
> events via sysfs.

Thanks Ravi! The following looks to address the issues and I'll add it to v4.

'''
diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 35b35a5c795c..2ff61ee8f970 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -559,7 +559,8 @@ static int test__checkevent_pmu_events(struct
evlist *evlist)
       struct evsel *evsel = evlist__first(evlist);

       TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->core.nr_entries);
-       TEST_ASSERT_VAL("wrong type", PERF_TYPE_RAW == evsel->core.attr.type);
+       TEST_ASSERT_VAL("wrong type", PERF_TYPE_RAW == evsel->core.attr.type ||
+                                     strncmp(evsel->pmu_name, "cpu/", 4));
       TEST_ASSERT_VAL("wrong exclude_user",
                       !evsel->core.attr.exclude_user);
       TEST_ASSERT_VAL("wrong exclude_kernel",
@@ -2229,6 +2230,9 @@ static int test__pmu_events(struct test_suite
*test __maybe_unused, int subtes
t
       struct perf_pmu *pmu;
       int ret = TEST_OK;

+       if (list_empty(&pmus))
+                perf_pmu__scan(NULL);
+
       perf_pmus__for_each_pmu(pmu) {
               struct stat st;
               char path[PATH_MAX];
@@ -2242,7 +2246,6 @@ static int test__pmu_events(struct test_suite
*test __maybe_unused, int subtes
t
               err = stat(path, &st);
               if (err) {
                       pr_debug("skipping PMU %s events tests: %s\n",
pmu->name, path);
-                       ret = combine_test_results(ret, TEST_SKIP);
                       continue;
               }
'''