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

[weilin . wang]

From: Weilin Wang <weilin.wang@xxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
---
 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");
+	}
+
 
 	return parse_groups(perf_evlist, pmu, str, metric_no_group, metric_no_merge,
 			    metric_no_threshold, user_requested_cpu_list, system_wide,
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index d5325c6ec8e1..779f6ede1b51 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -77,6 +77,7 @@ 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);
 int metricgroup__parse_groups_test(struct evlist *evlist,
 				   const struct pmu_metrics_table *table,
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index d6e5c8787ba2..fd7a187551bd 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -87,6 +87,7 @@ struct perf_stat_config {
 	bool			 metric_no_group;
 	bool			 metric_no_merge;
 	bool			 metric_no_threshold;
+	bool			 hardware_aware_grouping;
 	bool			 stop_read_counter;
 	bool			 iostat_run;
 	char			 *user_requested_cpu_list;
-- 
2.42.0