Date:   Fri, 22 Apr 2022 14:56:33 +0800
From:   zhengjun.xing@...ux.intel.com
To:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...el.com, jolsa@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com, adrian.hunter@...el.com, ak@...ux.intel.com,
        kan.liang@...ux.intel.com, zhengjun.xing@...ux.intel.com
Subject: [PATCH 1/3] perf stat: Support metrics with hybrid events

From: Zhengjun Xing <zhengjun.xing@...ux.intel.com>

One metric such as 'Kernel_Utilization' may be from different PMUs and
consists of different events.

For core,
Kernel_Utilization = cpu_clk_unhalted.thread:k / cpu_clk_unhalted.thread

For atom,
Kernel_Utilization = cpu_clk_unhalted.core:k / cpu_clk_unhalted.core

The metric group string for core is:
'{cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread:k/k,cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread/}:W'
It's internally expanded to:
'{cpu_clk_unhalted.thread_p/metric-id=cpu_clk_unhalted.thread_p:k/k,cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread/}:W#cpu_core'

The metric group string for atom is:
'{cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core:k/k,cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core/}:W'
It's internally expanded to:
'{cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core:k/k,cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core/}:W#cpu_atom'

That means the group "{cpu_clk_unhalted.thread:k,cpu_clk_unhalted.thread}:W"
is from cpu_core PMU and the group "{cpu_clk_unhalted.core:k,cpu_clk_unhalted.core}"
is from cpu_atom PMU. And then next, check if the events in the group are
valid on that PMU. If one event is not valid on that PMU, the associated
group would be removed internally.

In this example, cpu_clk_unhalted.thread is valid on cpu_core and
cpu_clk_unhalted.core is valid on cpu_atom. So the checks for these two
groups are passed.

Before:

  # ./perf stat -M Kernel_Utilization -a sleep 1
WARNING: events in group from different hybrid PMUs!
WARNING: grouped events cpus do not match, disabling group:
  anon group { CPU_CLK_UNHALTED.THREAD_P:k, CPU_CLK_UNHALTED.THREAD_P:k, CPU_CLK_UNHALTED.THREAD, CPU_CLK_UNHALTED.THREAD }

 Performance counter stats for 'system wide':

        17,639,501      cpu_atom/CPU_CLK_UNHALTED.CORE/ #     1.00 Kernel_Utilization
        17,578,757      cpu_atom/CPU_CLK_UNHALTED.CORE:k/
     1,005,350,226 ns   duration_time
        43,012,352      cpu_core/CPU_CLK_UNHALTED.THREAD_P:k/ #     0.99 Kernel_Utilization
        17,608,010      cpu_atom/CPU_CLK_UNHALTED.THREAD_P:k/
        43,608,755      cpu_core/CPU_CLK_UNHALTED.THREAD/
        17,630,838      cpu_atom/CPU_CLK_UNHALTED.THREAD/
     1,005,350,226 ns   duration_time

       1.005350226 seconds time elapsed

After:

  # ./perf stat -M Kernel_Utilization -a sleep 1

 Performance counter stats for 'system wide':

        17,981,895      CPU_CLK_UNHALTED.CORE [cpu_atom] #     1.00 Kernel_Utilization
        17,925,405      CPU_CLK_UNHALTED.CORE:k [cpu_atom]
     1,004,811,366 ns   duration_time
        41,246,425      CPU_CLK_UNHALTED.THREAD_P:k [cpu_core] #     0.99 Kernel_Utilization
        41,819,129      CPU_CLK_UNHALTED.THREAD [cpu_core]
     1,004,811,366 ns   duration_time

       1.004811366 seconds time elapsed

Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/util/metricgroup.c  | 263 ++++++++++++++++++++++++++++++---
 tools/perf/util/stat-display.c |   8 +-
 2 files changed, 249 insertions(+), 22 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index d8492e339521..126a43a8917e 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -141,6 +141,11 @@ struct metric {
 	 * output.
 	 */
 	const char *metric_unit;
+	/**
+	 * The name of the CPU such as "cpu_core" or "cpu_atom" in hybrid systems
+	 * and "NULL" in non-hybrid systems.
+	 */
+	const char *pmu_name;
 	/** Optional null terminated array of referenced metrics. */
 	struct metric_ref *metric_refs;
 	/**
@@ -215,6 +220,7 @@ static struct metric *metric__new(const struct pmu_event *pe,
 	}
 	m->metric_expr = pe->metric_expr;
 	m->metric_unit = pe->unit;
+	m->pmu_name = pe->pmu;
 	m->pctx->runtime = runtime;
 	m->has_constraint = metric_no_group || metricgroup__has_constraint(pe);
 	m->metric_refs = NULL;
@@ -250,10 +256,12 @@ static bool contains_metric_id(struct evsel **metric_events, int num_events,
  * @ids: the metric IDs to match.
  * @metric_evlist: the list of perf events.
  * @out_metric_events: holds the created metric events array.
+ * @pmu_name: the name of the CPU.
  */
 static int setup_metric_events(struct hashmap *ids,
 			       struct evlist *metric_evlist,
-			       struct evsel ***out_metric_events)
+			       struct evsel ***out_metric_events,
+			       const char *pmu_name)
 {
 	struct evsel **metric_events;
 	const char *metric_id;
@@ -286,6 +294,10 @@ static int setup_metric_events(struct hashmap *ids,
 		 * about this event.
 		 */
 		if (hashmap__find(ids, metric_id, (void **)&val_ptr)) {
+			if (evsel__is_hybrid(ev) && pmu_name &&
+			    strcmp(pmu_name, ev->pmu_name)) {
+				continue;
+			}
 			metric_events[matched_events++] = ev;
 
 			if (matched_events >= ids_size)
@@ -724,7 +736,8 @@ static int decode_all_metric_ids(struct evlist *perf_evlist, const char *modifie
 static int metricgroup__build_event_string(struct strbuf *events,
 					   const struct expr_parse_ctx *ctx,
 					   const char *modifier,
-					   bool has_constraint)
+					   bool has_constraint,
+					   const char *pmu_name)
 {
 	struct hashmap_entry *cur;
 	size_t bkt;
@@ -806,12 +819,18 @@ static int metricgroup__build_event_string(struct strbuf *events,
 		if (no_group) {
 			/* Strange case of a metric of just duration_time. */
 			ret = strbuf_addf(events, "duration_time");
-		} else if (!has_constraint)
-			ret = strbuf_addf(events, "}:W,duration_time");
-		else
+		} else if (!has_constraint) {
+			ret = strbuf_addf(events, "}:W");
+			if (pmu_name)
+				ret = strbuf_addf(events, "#%s", pmu_name);
 			ret = strbuf_addf(events, ",duration_time");
-	} else if (!no_group && !has_constraint)
+		} else
+			ret = strbuf_addf(events, ",duration_time");
+	} else if (!no_group && !has_constraint) {
 		ret = strbuf_addf(events, "}:W");
+		if (pmu_name)
+			ret = strbuf_addf(events, "#%s", pmu_name);
+	}
 
 	return ret;
 #undef RETURN_IF_NON_ZERO
@@ -1150,11 +1169,13 @@ static int metric_list_cmp(void *priv __maybe_unused, const struct list_head *l,
  * @metric_list: The list that the metric or metric group are added to.
  * @map: The map that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
+ * @pmu_name: the name of the CPU.
  */
-static int metricgroup__add_metric(const char *metric_name, const char *modifier,
-				   bool metric_no_group,
+static int metricgroup__add_metric(const char *metric_name,
+				   const char *modifier, bool metric_no_group,
 				   struct list_head *metric_list,
-				   const struct pmu_events_map *map)
+				   const struct pmu_events_map *map,
+				   const char *pmu_name)
 {
 	const struct pmu_event *pe;
 	LIST_HEAD(list);
@@ -1167,6 +1188,8 @@ static int metricgroup__add_metric(const char *metric_name, const char *modifier
 	 */
 	map_for_each_metric(pe, i, map, metric_name) {
 		has_match = true;
+		if (pmu_name && pe->pmu && strcmp(pmu_name, pe->pmu))
+			continue;
 		ret = add_metric(&list, pe, modifier, metric_no_group,
 				 /*root_metric=*/NULL,
 				 /*visited_metrics=*/NULL, map);
@@ -1215,10 +1238,12 @@ static int metricgroup__add_metric(const char *metric_name, const char *modifier
  * @metric_list: The list that metrics are added to.
  * @map: The map that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
+ * @pmu_name: the name of the CPU.
  */
 static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
 					struct list_head *metric_list,
-					const struct pmu_events_map *map)
+					const struct pmu_events_map *map,
+					const char *pmu_name)
 {
 	char *list_itr, *list_copy, *metric_name, *modifier;
 	int ret, count = 0;
@@ -1235,7 +1260,7 @@ static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
 
 		ret = metricgroup__add_metric(metric_name, modifier,
 					      metric_no_group, metric_list,
-					      map);
+					      map, pmu_name);
 		if (ret == -EINVAL)
 			pr_err("Cannot find metric or group `%s'\n", metric_name);
 
@@ -1310,6 +1335,183 @@ static int build_combined_expr_ctx(const struct list_head *metric_list,
 	return ret;
 }
 
+static char *get_metric_pmus(char *orig_str, struct strbuf *metric_pmus)
+{
+	char *llist, *nlist, *p1, *p2, *new_str = NULL;
+	int ret;
+	struct strbuf new_events;
+
+	if (!strchr(orig_str, '#')) {
+		/*
+		 * pmu name is added after '#'. If no '#' found,
+		 * don't need to process pmu.
+		 */
+		return strdup(orig_str);
+	}
+
+	nlist = strdup(orig_str);
+	if (!nlist)
+		return new_str;
+
+	ret = strbuf_init(&new_events, 100);
+	if (ret)
+		goto err_out;
+
+	ret = strbuf_grow(metric_pmus, 100);
+	if (ret)
+		goto err_out;
+
+	llist = nlist;
+	while ((p1 = strsep(&llist, ",")) != NULL) {
+		p2 = strchr(p1, '#');
+		if (p2) {
+			*p2 = 0;
+			ret = strbuf_addf(&new_events, "%s,", p1);
+			if (ret)
+				goto err_out;
+
+			ret = strbuf_addf(metric_pmus, "%s,", p2 + 1);
+			if (ret)
+				goto err_out;
+
+		} else {
+			ret = strbuf_addf(&new_events, "%s,", p1);
+			if (ret)
+				goto err_out;
+		}
+	}
+
+	new_str = strdup(new_events.buf);
+	if (new_str) {
+		/* Remove last ',' */
+		new_str[strlen(new_str) - 1] = 0;
+	}
+err_out:
+	free(nlist);
+	strbuf_release(&new_events);
+	return new_str;
+}
+
+static void set_pmu_unmatched_events(struct evlist *evlist, int group_idx,
+				     char *pmu_name,
+				     unsigned long *evlist_removed)
+{
+	struct evsel *evsel, *pos;
+	int i = 0, j = 0;
+
+	/*
+	 * Move to the first evsel of a given group
+	 */
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel__is_group_leader(evsel) &&
+		    evsel->core.nr_members >= 1) {
+			if (i < group_idx) {
+				j += evsel->core.nr_members;
+				i++;
+				continue;
+			}
+		}
+	}
+
+	i = 0;
+	evlist__for_each_entry(evlist, evsel) {
+		if (i < j) {
+			i++;
+			continue;
+		}
+
+		/*
+		 * Now we are at the first evsel in the group
+		 */
+		for_each_group_evsel(pos, evsel) {
+			if (evsel__is_hybrid(pos) &&
+			    strcmp(pos->pmu_name, pmu_name)) {
+				set_bit(pos->core.idx, evlist_removed);
+			}
+		}
+		break;
+	}
+}
+
+static void remove_pmu_umatched_events(struct evlist *evlist, char *metric_pmus)
+{
+	struct evsel *evsel, *tmp, *new_leader = NULL;
+	unsigned long *evlist_removed;
+	char *llist, *nlist, *p1;
+	bool need_new_leader = false;
+	int i = 0, new_nr_members = 0;
+
+	nlist = strdup(metric_pmus);
+	if (!nlist)
+		return;
+
+	evlist_removed = bitmap_zalloc(evlist->core.nr_entries);
+	if (!evlist_removed) {
+		free(nlist);
+		return;
+	}
+
+	llist = nlist;
+	while ((p1 = strsep(&llist, ",")) != NULL) {
+		if (strlen(p1) > 0) {
+			/*
+			 * p1 points to the string of pmu name, e.g. "cpu_atom".
+			 * The metric group string has pmu suffixes, e.g.
+			 * "{inst_retired.any,cpu_clk_unhalted.thread}:W#cpu_core,
+			 *  {cpu_clk_unhalted.core,inst_retired.any_p}:W#cpu_atom"
+			 * By counting the pmu name, we can know the index of
+			 * group.
+			 */
+			set_pmu_unmatched_events(evlist, i++, p1,
+						 evlist_removed);
+		}
+	}
+
+	evlist__for_each_entry_safe(evlist, tmp, evsel) {
+		if (test_bit(evsel->core.idx, evlist_removed)) {
+			if (!evsel__is_group_leader(evsel)) {
+				if (!need_new_leader) {
+					if (new_leader)
+						new_leader->core.leader->nr_members--;
+					else
+						evsel->core.leader->nr_members--;
+				} else
+					new_nr_members--;
+			} else {
+				/*
+				 * If group leader is to remove, we need to
+				 * prepare a new leader and adjust all group
+				 * members.
+				 */
+				need_new_leader = true;
+				new_nr_members =
+				    evsel->core.leader->nr_members - 1;
+			}
+
+			evlist__remove(evlist, evsel);
+			evsel__delete(evsel);
+		} else {
+			if (!evsel__is_group_leader(evsel)) {
+				if (need_new_leader) {
+					need_new_leader = false;
+					new_leader = evsel;
+					new_leader->core.leader =
+					    &new_leader->core;
+					new_leader->core.nr_members =
+					    new_nr_members;
+				} else if (new_leader)
+					evsel->core.leader = &new_leader->core;
+			} else {
+				need_new_leader = false;
+				new_leader = NULL;
+			}
+		}
+	}
+
+	bitmap_free(evlist_removed);
+	free(nlist);
+}
+
 /**
  * parse_ids - Build the event string for the ids and parse them creating an
  *             evlist. The encoded metric_ids are decoded.
@@ -1319,14 +1521,18 @@ static int build_combined_expr_ctx(const struct list_head *metric_list,
  * @modifier: any modifiers added to the events.
  * @has_constraint: false if events should be placed in a weak group.
  * @out_evlist: the created list of events.
+ * @pmu_name: the name of the CPU.
  */
 static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
 		     struct expr_parse_ctx *ids, const char *modifier,
-		     bool has_constraint, struct evlist **out_evlist)
+		     bool has_constraint, struct evlist **out_evlist,
+		     const char *pmu_name)
 {
 	struct parse_events_error parse_error;
 	struct evlist *parsed_evlist;
 	struct strbuf events = STRBUF_INIT;
+	struct strbuf metric_pmus = STRBUF_INIT;
+	char *nlist = NULL;
 	int ret;
 
 	*out_evlist = NULL;
@@ -1353,7 +1559,7 @@ static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
 		ids__insert(ids->ids, tmp);
 	}
 	ret = metricgroup__build_event_string(&events, ids, modifier,
-					      has_constraint);
+					      has_constraint, pmu_name);
 	if (ret)
 		return ret;
 
@@ -1364,11 +1570,20 @@ static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
 	}
 	pr_debug("Parsing metric events '%s'\n", events.buf);
 	parse_events_error__init(&parse_error);
-	ret = __parse_events(parsed_evlist, events.buf, &parse_error, fake_pmu);
+	nlist = get_metric_pmus(events.buf, &metric_pmus);
+	if (!nlist) {
+		ret = -ENOMEM;
+		goto err_out;
+	}
+	ret = __parse_events(parsed_evlist, nlist, &parse_error, fake_pmu);
 	if (ret) {
 		parse_events_error__print(&parse_error, events.buf);
 		goto err_out;
 	}
+
+	if (metric_pmus.alloc)
+		remove_pmu_umatched_events(parsed_evlist, metric_pmus.buf);
+
 	ret = decode_all_metric_ids(parsed_evlist, modifier);
 	if (ret)
 		goto err_out;
@@ -1376,9 +1591,12 @@ static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
 	*out_evlist = parsed_evlist;
 	parsed_evlist = NULL;
 err_out:
+	if (nlist)
+		free(nlist);
 	parse_events_error__exit(&parse_error);
 	evlist__delete(parsed_evlist);
 	strbuf_release(&events);
+	strbuf_release(&metric_pmus);
 	return ret;
 }
 
@@ -1397,7 +1615,8 @@ static int parse_groups(struct evlist *perf_evlist, const char *str,
 	if (metric_events_list->nr_entries == 0)
 		metricgroup__rblist_init(metric_events_list);
 	ret = metricgroup__add_metric_list(str, metric_no_group,
-					   &metric_list, map);
+					   &metric_list, map,
+					   perf_evlist->hybrid_pmu_name);
 	if (ret)
 		goto out;
 
@@ -1413,7 +1632,8 @@ static int parse_groups(struct evlist *perf_evlist, const char *str,
 			ret = parse_ids(metric_no_merge, fake_pmu, combined,
 					/*modifier=*/NULL,
 					/*has_constraint=*/true,
-					&combined_evlist);
+					&combined_evlist,
+					perf_evlist->hybrid_pmu_name);
 		}
 		if (combined)
 			expr__ctx_free(combined);
@@ -1450,6 +1670,9 @@ static int parse_groups(struct evlist *perf_evlist, const char *str,
 					continue;
 
 				if (expr__subset_of_ids(n->pctx, m->pctx)) {
+					if (m->pmu_name && n->pmu_name
+					    && strcmp(m->pmu_name, n->pmu_name))
+						continue;
 					pr_debug("Events in '%s' fully contained within '%s'\n",
 						 m->metric_name, n->metric_name);
 					metric_evlist = n->evlist;
@@ -1459,14 +1682,16 @@ static int parse_groups(struct evlist *perf_evlist, const char *str,
 			}
 		}
 		if (!metric_evlist) {
-			ret = parse_ids(metric_no_merge, fake_pmu, m->pctx, m->modifier,
-					m->has_constraint, &m->evlist);
+			ret = parse_ids(metric_no_merge, fake_pmu, m->pctx,
+				      m->modifier, m->has_constraint,
+				      &m->evlist, m->pmu_name);
 			if (ret)
 				goto out;
 
 			metric_evlist = m->evlist;
 		}
-		ret = setup_metric_events(m->pctx->ids, metric_evlist, &metric_events);
+		ret = setup_metric_events(m->pctx->ids, metric_evlist,
+					  &metric_events, m->pmu_name);
 		if (ret) {
 			pr_debug("Cannot resolve IDs for %s: %s\n",
 				m->metric_name, m->metric_expr);
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 138e3ab9d638..46b3dd134656 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -539,7 +539,8 @@ static void aggr_update_shadow(struct perf_stat_config *config,
 	}
 }
 
-static void uniquify_event_name(struct evsel *counter)
+static void uniquify_event_name(struct evsel *counter,
+				struct perf_stat_config *stat_config)
 {
 	char *new_name;
 	char *config;
@@ -558,7 +559,8 @@ static void uniquify_event_name(struct evsel *counter)
 			counter->name = new_name;
 		}
 	} else {
-		if (perf_pmu__has_hybrid()) {
+		if (perf_pmu__has_hybrid() &&
+		    stat_config->metric_events.nr_entries == 0) {
 			ret = asprintf(&new_name, "%s/%s/",
 				       counter->pmu_name, counter->name);
 		} else {
@@ -619,7 +621,7 @@ static bool collect_data(struct perf_stat_config *config, struct evsel *counter,
 		return false;
 	cb(config, counter, data, true);
 	if (config->no_merge || hybrid_uniquify(counter))
-		uniquify_event_name(counter);
+		uniquify_event_name(counter, config);
 	else if (counter->auto_merge_stats)
 		collect_all_aliases(config, counter, cb, data);
 	return true;
-- 
2.25.1

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