Re: [PATCH 5/8] perf stat,jevents: Introduce Default tags for the default mode

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

On 2023-06-13 3:59 p.m., Ian Rogers wrote:
> On Wed, Jun 7, 2023 at 9:27 AM <kan.liang@linux.intel.com> wrote:
>>
>> From: Kan Liang <kan.liang@linux.intel.com>
>>
>> Introduce a new metricgroup, Default, to tag all the metric groups which
>> will be collected in the default mode.
>>
>> Add a new field, DefaultMetricgroupName, in the JSON file to indicate
>> the real metric group name. It will be printed in the default output
>> to replace the event names.
>>
>> There is nothing changed for the output format.
>>
>> On SPR, both TopdownL1 and TopdownL2 are displayed in the default
>> output.
>>
>> On ARM, Intel ICL and later platforms (before SPR), only TopdownL1 is
>> displayed in the default output.
>>
>> Suggested-by: Stephane Eranian <eranian@google.com>
>> Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
>> ---
>>  tools/perf/builtin-stat.c          | 4 ++--
>>  tools/perf/pmu-events/jevents.py   | 5 +++--
>>  tools/perf/pmu-events/pmu-events.h | 1 +
>>  tools/perf/util/metricgroup.c      | 3 +++
>>  4 files changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
>> index c87c6897edc9..2269b3e90e9b 100644
>> --- a/tools/perf/builtin-stat.c
>> +++ b/tools/perf/builtin-stat.c
>> @@ -2154,14 +2154,14 @@ static int add_default_attributes(void)
>>                  * Add TopdownL1 metrics if they exist. To minimize
>>                  * multiplexing, don't request threshold computation.
>>                  */
>> -               if (metricgroup__has_metric(pmu, "TopdownL1")) {
>> +               if (metricgroup__has_metric(pmu, "Default")) {
>>                         struct evlist *metric_evlist = evlist__new();
>>                         struct evsel *metric_evsel;
>>
>>                         if (!metric_evlist)
>>                                 return -1;
>>
>> -                       if (metricgroup__parse_groups(metric_evlist, pmu, "TopdownL1",
>> +                       if (metricgroup__parse_groups(metric_evlist, pmu, "Default",
>>                                                         /*metric_no_group=*/false,
>>                                                         /*metric_no_merge=*/false,
>>                                                         /*metric_no_threshold=*/true,
>> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
>> index 7ed258be1829..12e80bb7939b 100755
>> --- a/tools/perf/pmu-events/jevents.py
>> +++ b/tools/perf/pmu-events/jevents.py
>> @@ -54,8 +54,8 @@ _json_event_attributes = [
>>  # Attributes that are in pmu_metric rather than pmu_event.
>>  _json_metric_attributes = [
>>      'pmu', 'metric_name', 'metric_group', 'metric_expr', 'metric_threshold',
>> -    'desc', 'long_desc', 'unit', 'compat', 'metricgroup_no_group', 'aggr_mode',
>> -    'event_grouping'
>> +    'desc', 'long_desc', 'unit', 'compat', 'metricgroup_no_group',
>> +    'default_metricgroup_name', 'aggr_mode', 'event_grouping'
>>  ]
>>  # Attributes that are bools or enum int values, encoded as '0', '1',...
>>  _json_enum_attributes = ['aggr_mode', 'deprecated', 'event_grouping', 'perpkg']
>> @@ -307,6 +307,7 @@ class JsonEvent:
>>      self.metric_name = jd.get('MetricName')
>>      self.metric_group = jd.get('MetricGroup')
>>      self.metricgroup_no_group = jd.get('MetricgroupNoGroup')
>> +    self.default_metricgroup_name = jd.get('DefaultMetricgroupName')
>>      self.event_grouping = convert_metric_constraint(jd.get('MetricConstraint'))
>>      self.metric_expr = None
>>      if 'MetricExpr' in jd:
>> diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
>> index 8cd23d656a5d..caf59f23cd64 100644
>> --- a/tools/perf/pmu-events/pmu-events.h
>> +++ b/tools/perf/pmu-events/pmu-events.h
>> @@ -61,6 +61,7 @@ struct pmu_metric {
>>         const char *desc;
>>         const char *long_desc;
>>         const char *metricgroup_no_group;
>> +       const char *default_metricgroup_name;
>>         enum aggr_mode_class aggr_mode;
>>         enum metric_event_groups event_grouping;
>>  };
>> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
>> index 74f2d8efc02d..efafa02db5e5 100644
>> --- a/tools/perf/util/metricgroup.c
>> +++ b/tools/perf/util/metricgroup.c
>> @@ -137,6 +137,8 @@ struct metric {
>>          * output.
>>          */
>>         const char *metric_unit;
>> +       /** Optional default metric group name */
>> +       const char *default_metricgroup_name;
> 
> Adding a bit more to the comment would be useful, like:
> 
> Optional name of the metric group reported if the Default metric group
> is being processed.

Sure.

Thanks,
Kan
> 
>>         /** Optional null terminated array of referenced metrics. */
>>         struct metric_ref *metric_refs;
>>         /**
>> @@ -219,6 +221,7 @@ static struct metric *metric__new(const struct pmu_metric *pm,
>>
>>         m->pmu = pm->pmu ?: "cpu";
>>         m->metric_name = pm->metric_name;
>> +       m->default_metricgroup_name = pm->default_metricgroup_name;
>>         m->modifier = NULL;
>>         if (modifier) {
>>                 m->modifier = strdup(modifier);
>> --
>> 2.35.1
>>