linux-kernel - Re: [PATCH 4/7] perf test: Basic mmap use skip

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Date:   Tue, 17 May 2022 20:48:41 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Sohaib Mohamed <sohaib.amhmd@...il.com>,
        Carsten Haitzler <carsten.haitzler@....com>,
        Marco Elver <elver@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Michael Petlan <mpetlan@...hat.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/7] perf test: Basic mmap use skip

On Mon, May 16, 2022 at 8:43 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Thu, May 12, 2022 at 9:05 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > If opening the first event fails for basic mmap it is more likely
> > permission related that a true error. Mark the test as skip in this
> > case and add a skip reason.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/tests/mmap-basic.c | 22 ++++++++++++++++++++--
> >  1 file changed, 20 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
> > index c3c17600f29c..32f0a63fa157 100644
> > --- a/tools/perf/tests/mmap-basic.c
> > +++ b/tools/perf/tests/mmap-basic.c
> > @@ -31,7 +31,7 @@
> >   */
> >  static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
> >  {
> > -       int err = -1;
> > +       int err = TEST_FAIL;
> >         union perf_event *event;
> >         struct perf_thread_map *threads;
> >         struct perf_cpu_map *cpus;
> > @@ -83,6 +83,14 @@ static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest
> >                 evsels[i] = evsel__newtp("syscalls", name);
> >                 if (IS_ERR(evsels[i])) {
> >                         pr_debug("evsel__new(%s)\n", name);
> > +                       if (i == 0) {
> > +                               /*
> > +                                * Failure to open first event is more likely
> > +                                * related to permissions so flag the failure as
> > +                                * a skip.
> > +                                */
> > +                               err = TEST_SKIP;
>
> This is not about perf_event_open() but it accesses
> tracefs to get the type number of the trace event.
>
> The evsel__newtp() seems to return the errno in a
> negative number.  It'd be better to check if it's
> -EACCES actually.

Thanks, done in v2.

Ian

> Thanks,
> Namhyung
>
>
> > +                       }
> >                         goto out_delete_evlist;
> >                 }
> >
> > @@ -166,4 +174,14 @@ static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest
> >         return err;
> >  }
> >
> > -DEFINE_SUITE("Read samples using the mmap interface", basic_mmap);
> > +static struct test_case tests__basic_mmap[] = {
> > +       TEST_CASE_REASON("Read samples using the mmap interface",
> > +                        basic_mmap,
> > +                        "permissions"),
> > +       {       .name = NULL, }
> > +};
> > +
> > +struct test_suite suite__basic_mmap = {
> > +       .desc = "Read samples using the mmap interface",
> > +       .test_cases = tests__basic_mmap,
> > +};
> > --
> > 2.36.0.550.gb090851708-goog
> >