linux-kernel - [RFC PATCH 21/25] perf stat: Add tool events support in hardware-grouping

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Message-Id: <20230925061824.3818631-22-weilin.wang@intel.com>
Date:   Sun, 24 Sep 2023 23:18:20 -0700
From:   weilin.wang@...el.com
To:     weilin.wang@...el.com, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>
Cc:     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>,
        Mark Rutland <mark.rutland@....com>
Subject: [RFC PATCH 21/25] perf stat: Add tool events support in hardware-grouping

From: Weilin Wang <weilin.wang@...el.com>

Add tool events into default_core grouping strings if find tool events so
that metrics use tool events could be correctly calculated. Need this step
to support TopdownL4-L5.

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/util/metricgroup.c | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 3c569d838..d10f6afb0 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1950,6 +1950,7 @@ static int assign_event_grouping(struct metricgroup__event_info *e,
 
 static int hw_aware_metricgroup__build_event_string(struct list_head *group_strs,
 					   const char *modifier,
+					   const bool tool_events[PERF_TOOL_MAX],
 					   struct list_head *groups)
 {
 	struct metricgroup__pmu_group_list *p;
@@ -2029,6 +2030,22 @@ static int hw_aware_metricgroup__build_event_string(struct list_head *group_strs
 			}
 			ret = strbuf_addf(events, "}:W");
 			RETURN_IF_NON_ZERO(ret);
+			if (!strcmp(p->pmu_name, "default_core")) {
+				int i = 0;
+
+				perf_tool_event__for_each_event(i) {
+					if (tool_events[i]) {
+						const char *tmp = strdup(perf_tool_event__to_str(i));
+
+						if (!tmp)
+							return -ENOMEM;
+						ret = strbuf_addstr(events, ",");
+						RETURN_IF_NON_ZERO(ret);
+						ret = strbuf_addstr(events, tmp);
+						RETURN_IF_NON_ZERO(ret);
+					}
+				}
+			}
 			pr_debug("events-buf: %s\n", events->buf);
 			list_add_tail(&new_group_str->nd, group_strs);
 		}
@@ -2094,7 +2111,8 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx,
 		pr_debug("found event %s\n", id);
 		if (!strncmp(id, special_pattern, strlen(special_pattern))) {
 			struct metricgroup__event_info *event;
-			event = event_info__new(id, "default_core", "0", false, true);
+			event = event_info__new(id, "default_core", "0", false,
+						/*free_counter=*/true);
 			if (!event) {
 				ret = -ENOMEM;
 				goto err_out;
@@ -2106,6 +2124,7 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx,
 		if (ret)
 			goto err_out;
 	}
+
 	ret = get_pmu_counter_layouts(&pmu_info_list, ltable);
 	if (ret)
 		goto err_out;
@@ -2151,6 +2170,7 @@ static void metricgroup__free_grouping_strs(struct list_head
  */
 static int hw_aware_parse_ids(struct perf_pmu *fake_pmu,
 			     struct expr_parse_ctx *ids, const char *modifier,
+			     const bool tool_events[PERF_TOOL_MAX],
 			     struct evlist **out_evlist)
 {
 	struct parse_events_error parse_error;
@@ -2164,7 +2184,8 @@ static int hw_aware_parse_ids(struct perf_pmu *fake_pmu,
 	ret = hw_aware_build_grouping(ids, &grouping);
 	if (ret)
 		goto err_out;
-	ret = hw_aware_metricgroup__build_event_string(&grouping_str, modifier, &grouping);
+	ret = hw_aware_metricgroup__build_event_string(&grouping_str, modifier,
+						      tool_events, &grouping);
 	if (ret)
 		goto err_out;
 
@@ -2298,6 +2319,7 @@ static int hw_aware_parse_groups(struct evlist *perf_evlist,
 	struct evlist *combined_evlist = NULL;
 	LIST_HEAD(metric_list);
 	struct metric *m;
+	bool tool_events[PERF_TOOL_MAX] = {false};
 	int ret;
 	bool metric_no_group = false;
 	bool metric_no_merge = false;
@@ -2316,11 +2338,14 @@ static int hw_aware_parse_groups(struct evlist *perf_evlist,
 	if (!metric_no_merge) {
 		struct expr_parse_ctx *combined = NULL;
 
+		find_tool_events(&metric_list, tool_events);
+
 		ret = hw_aware_build_combined_expr_ctx(&metric_list, &combined);
 
 		if (!ret && combined && hashmap__size(combined->ids)) {
 			ret = hw_aware_parse_ids(fake_pmu, combined,
 						/*modifier=*/NULL,
+						tool_events,
 						&combined_evlist);
 		}
 
-- 
2.39.3