[RFC PATCH v2 01/17] perf stat: Add hardware-grouping cmd option to perf stat

[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.

Add a cmd option to allow user to choose this new metric grouping method.

$ perf stat -M TopdownL1 -a --hardware-grouping

Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
---
 tools/perf/builtin-stat.c     | 7 +++++++
 tools/perf/util/metricgroup.c | 5 +++++
 tools/perf/util/metricgroup.h | 1 +
 tools/perf/util/stat.h        | 1 +
 4 files changed, 14 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 07b48f6df..1a7dbfff5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1256,6 +1256,8 @@ static struct option stat_options[] = {
 		       "don't try to share events between metrics in a group"),
 	OPT_BOOLEAN(0, "metric-no-threshold", &stat_config.metric_no_threshold,
 		       "don't try to share events between metrics in a group  "),
+	OPT_BOOLEAN(0, "hardware-grouping", &stat_config.hardware_aware_grouping,
+		   "Use hardware aware metric grouping method"),
 	OPT_BOOLEAN(0, "topdown", &topdown_run,
 			"measure top-down statistics"),
 	OPT_UINTEGER(0, "td-level", &stat_config.topdown_level,
@@ -2061,6 +2063,7 @@ 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);
 	}
 
@@ -2094,6 +2097,7 @@ 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);
 	}
 
@@ -2128,6 +2132,7 @@ 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;
 	}
@@ -2169,6 +2174,7 @@ 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;
 
@@ -2702,6 +2708,7 @@ 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 6231044a4..b08af6860 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 d5325c6ec..779f6ede1 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 325d0fad1..f97d6282b 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;
-- 
2.39.3