linux-kernel - [PATCH 3/7] perf lock: Skip print_bad

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Date:   Wed,  8 Jun 2022 22:56:48 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: [PATCH 3/7] perf lock: Skip print_bad_events() if nothing bad

The debug output is meaningful when there are bad lock sequences.
Skip it unless there's one or -v option is given.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-lock.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 118a036a81fb..2337b09dd2cd 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -858,9 +858,16 @@ static void print_bad_events(int bad, int total)
 {
 	/* Output for debug, this have to be removed */
 	int i;
+	int broken = 0;
 	const char *name[4] =
 		{ "acquire", "acquired", "contended", "release" };
 
+	for (i = 0; i < BROKEN_MAX; i++)
+		broken += bad_hist[i];
+
+	if (broken == 0 && !verbose)
+		return;
+
 	pr_info("\n=== output for debug===\n\n");
 	pr_info("bad: %d, total: %d\n", bad, total);
 	pr_info("bad rate: %.2f %%\n", (double)bad / (double)total * 100);
-- 
2.36.1.255.ge46751e96f-goog