linux-kernel - [PATCH] perf stat: Update event skip condition

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Date:   Mon,  5 Dec 2022 15:16:30 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>
Subject: [PATCH] perf stat: Update event skip condition

In print_counter_aggrdata(), it skips some events that has no aggregate
count.  It's actually for system-wide per-thread mode and merged uncore
and hybrid events.

Let's update the condition to check them explicitly.

Fixes: 91f85f98da7a ("Display event stats using aggr counts")
Reported-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
Athira, could you please check this fixes the problem?

 tools/perf/util/stat-display.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 847acdb5dc40..6c0de52ac4be 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -814,7 +814,8 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
 	os->nr = aggr->nr;
 	os->evsel = counter;
 
-	if (counter->supported && aggr->nr == 0)
+	/* Skip already merged uncore/hybrid events */
+	if (counter->merged_stat)
 		return;
 
 	uniquify_counter(config, counter);
@@ -823,6 +824,13 @@ static void print_counter_aggrdata(struct perf_stat_config *config,
 	ena = aggr->counts.ena;
 	run = aggr->counts.run;
 
+	/*
+	 * Skip value 0 when enabling --per-thread globally, otherwise it will
+	 * have too many 0 output.
+	 */
+	if (val == 0 && config->aggr_mode == AGGR_THREAD && config->system_wide)
+		return;
+
 	if (!metric_only) {
 		if (config->json_output)
 			fputc('{', output);
@@ -899,9 +907,6 @@ static void print_aggr(struct perf_stat_config *config,
 		print_metric_begin(config, evlist, os, s);
 
 		evlist__for_each_entry(evlist, counter) {
-			if (counter->merged_stat)
-				continue;
-
 			print_counter_aggrdata(config, counter, s, os);
 		}
 		print_metric_end(config, os);
@@ -928,9 +933,6 @@ static void print_aggr_cgroup(struct perf_stat_config *config,
 			print_metric_begin(config, evlist, os, s);
 
 			evlist__for_each_entry(evlist, counter) {
-				if (counter->merged_stat)
-					continue;
-
 				if (counter->cgrp != os->cgrp)
 					continue;
 
-- 
2.39.0.rc0.267.gcb52ba06e7-goog