linux-kernel - Re: [PATCH v3]: perf record: enable arbitrary event names thru name= modifier

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Message-ID: <20180605153311.GK4899@kernel.org>
Date:   Tue, 5 Jun 2018 12:33:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v3]: perf record: enable arbitrary event names thru name=
 modifier

Em Tue, Jun 05, 2018 at 09:00:17AM +0300, Alexey Budankov escreveu:
> Hi,
> On 04.06.2018 22:16, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Jun 04, 2018 at 06:22:43PM +0300, Alexey Budankov escreveu:
> >> On 04.06.2018 17:58, Arnaldo Carvalho de Melo wrote:
> >>> Em Mon, Jun 04, 2018 at 05:51:03PM +0300, Alexey Budankov escreveu:
> >>>> event names quoted there. If such cases were pointed out then they also 
> >>>> could be addressed along with the unit/regression testing mentioned above.
> > 
> >>> So lests stick to just the unit/regression testing, can you take a look
> >>> at that?
> >  
> >> Sure. Is it enough to run perf record with some quoted event name to make 
> >> sure it runs successfully?
> > 
> > I mentioned tools/perf/tests/attr/, for checking if the perf_event_attr
> > was setup the way you intended, and tools/perf/tests/parse-events.c,
> > which probably is what we want here, see, for instance, this cset I've
> > added recently to have we testing intel_pt event parsing:
> > 
> > $ git show b3f58c8da64bc63bd0c0a06a4e2cf258a3d20be6
> > commit b3f58c8da64bc63bd0c0a06a4e2cf258a3d20be6
> > Author: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Date:   Fri May 11 11:48:54 2018 -0300
> > 
> >     perf tests parse-events: Add intel_pt parse test
> >     
> >     To avoid regressions such as the one fixed by 4a35a9027f64 ("Revert
> >     "perf pmu: Fix pmu events parsing rule""), where '-e intel_pt//u' got
> >     broken, with this new entry in this 'perf tests' subtest, we would have
> >     caught it before pushing upstream.
> >     
> >     Acked-by: Jiri Olsa <jolsa@...nel.org>
> >     Cc: Adrian Hunter <adrian.hunter@...el.com>
> >     Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> >     Cc: Andi Kleen <ak@...ux.intel.com>
> >     Cc: David Ahern <dsahern@...il.com>
> >     Cc: Jiri Olsa <jolsa@...nel.org>
> >     Cc: Kan Liang <kan.liang@...ux.intel.com>
> >     Cc: Namhyung Kim <namhyung@...nel.org>
> >     Cc: Peter Zijlstra <peterz@...radead.org>
> >     Cc: Wang Nan <wangnan0@...wei.com>
> >     Link: https://lkml.kernel.org/n/tip-kw62fys9bwdgsp722so2ln1l@git.kernel.org
> >     Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > 
> > diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> > index 18b06444f230..6829dd416a99 100644
> > --- a/tools/perf/tests/parse-events.c
> > +++ b/tools/perf/tests/parse-events.c
> > @@ -1309,6 +1309,14 @@ static int test__checkevent_config_cache(struct perf_evlist *evlist)
> >  	return 0;
> >  }
> >  
> > +static int test__intel_pt(struct perf_evlist *evlist)
> > +{
> > +	struct perf_evsel *evsel = perf_evlist__first(evlist);
> > +
> > +	TEST_ASSERT_VAL("wrong name setting", strcmp(evsel->name, "intel_pt//u") == 0);
> > +	return 0;
> > +}
> > +
> >  static int count_tracepoints(void)
> >  {
> >  	struct dirent *events_ent;
> > @@ -1637,6 +1645,11 @@ static struct evlist_test test__events[] = {
> >  		.check = test__checkevent_config_cache,
> >  		.id    = 51,
> >  	},
> > +	{
> > +		.name  = "intel_pt//u",
> > +		.check = test__intel_pt,
> > +		.id    = 52,
> > +	},
> >  };
> >  
> >  static struct evlist_test test__events_pmu[] = {
> > 
> > See also this one:
> > 
> > static int
> > test__checkevent_breakpoint_len_rw_modifier(struct perf_evlist *evlist)
> > {
> >         struct perf_evsel *evsel = perf_evlist__first(evlist);
> > 
> >         TEST_ASSERT_VAL("wrong exclude_user", !evsel->attr.exclude_user);
> >         TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
> >         TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
> >         TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
> > 
> >         return test__checkevent_breakpoint_rw(evlist);
> > }
> >         {
> >                 .name  = "mem:0/4:rw:u",
> >                 .check = test__checkevent_breakpoint_len_rw_modifier,
> >                 .id    = 44
> >         },
> > 
> > 
> > I.e. have as many TEST_ASSERT_VAL as you need, checking how parsing the
> > event name ends up setting up the evsel, evlist and perf_event_attr.
> 
> Ok, I see. But please expect delay in delivery since I am on vacations till 06/18.

np.

- Arnaldo