linux-kernel - Re: [RFC PATCH v5 01/16] perf stat: Add new field in stat_config to enable hardware aware grouping.

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Date: Wed, 17 Apr 2024 13:21:31 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: weilin.wang@...el.com, Kan Liang <kan.liang@...ux.intel.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Perry Taylor <perry.taylor@...el.com>,
	Samantha Alt <samantha.alt@...el.com>,
	Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [RFC PATCH v5 01/16] perf stat: Add new field in stat_config to
 enable hardware aware grouping.

On Tue, Apr 16, 2024 at 08:49:21PM -0700, Ian Rogers wrote:
> On Fri, Apr 12, 2024 at 2:08 PM <weilin.wang@...el.com> wrote:
> >
> > From: Weilin Wang <weilin.wang@...el.com>
> >
> > Hardware counter and event information could be used to help creating event
> > groups that better utilize hardware counters and improve multiplexing.
> >
> > Reviewed-by: Ian Rogers <irogers@...gle.com>
> > Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> > ---
> >  tools/perf/builtin-stat.c     | 5 +++++
> >  tools/perf/util/metricgroup.c | 5 +++++
> >  tools/perf/util/metricgroup.h | 1 +
> >  tools/perf/util/stat.h        | 1 +
> >  4 files changed, 12 insertions(+)
> >
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index 6bba1a89d030..c4a5f0984295 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -2106,6 +2106,7 @@ static int add_default_attributes(void)
> >                                                 stat_config.metric_no_threshold,
> >                                                 stat_config.user_requested_cpu_list,
> >                                                 stat_config.system_wide,
> > +                                               stat_config.hardware_aware_grouping,
> >                                                 &stat_config.metric_events);
> >         }
> >
> > @@ -2139,6 +2140,7 @@ static int add_default_attributes(void)
> >                                                 stat_config.metric_no_threshold,
> >                                                 stat_config.user_requested_cpu_list,
> >                                                 stat_config.system_wide,
> > +                                               stat_config.hardware_aware_grouping,
> >                                                 &stat_config.metric_events);
> >         }
> >
> > @@ -2173,6 +2175,7 @@ static int add_default_attributes(void)
> >                                                 /*metric_no_threshold=*/true,
> >                                                 stat_config.user_requested_cpu_list,
> >                                                 stat_config.system_wide,
> > +                                               stat_config.hardware_aware_grouping,
> >                                                 &stat_config.metric_events) < 0)
> >                         return -1;
> >         }
> > @@ -2214,6 +2217,7 @@ static int add_default_attributes(void)
> >                                                         /*metric_no_threshold=*/true,
> >                                                         stat_config.user_requested_cpu_list,
> >                                                         stat_config.system_wide,
> > +                                                       stat_config.hardware_aware_grouping,
> >                                                         &stat_config.metric_events) < 0)
> >                                 return -1;
> >
> > @@ -2748,6 +2752,7 @@ int cmd_stat(int argc, const char **argv)
> >                                                 stat_config.metric_no_threshold,
> >                                                 stat_config.user_requested_cpu_list,
> >                                                 stat_config.system_wide,
> > +                                               stat_config.hardware_aware_grouping,
> >                                                 &stat_config.metric_events);
> >
> >                 zfree(&metrics);
> > diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> > index 79ef6095ab28..11613450725a 100644
> > --- a/tools/perf/util/metricgroup.c
> > +++ b/tools/perf/util/metricgroup.c
> > @@ -1690,12 +1690,17 @@ int metricgroup__parse_groups(struct evlist *perf_evlist,
> >                               bool metric_no_threshold,
> >                               const char *user_requested_cpu_list,
> >                               bool system_wide,
> > +                             bool hardware_aware_grouping,
> >                               struct rblist *metric_events)
> >  {
> >         const struct pmu_metrics_table *table = pmu_metrics_table__find();
> >
> >         if (!table)
> >                 return -EINVAL;
> > +       if (hardware_aware_grouping) {
> > +               pr_debug("Use hardware aware grouping instead of traditional metric grouping method\n");
> > +       }
> 
> nit: single line if statements shouldn't have curlies:
> https://www.kernel.org/doc/html/v6.8/process/coding-style.html#placing-braces-and-spaces

Fixed  this while applying this patch.

- Arnaldo