linux-kernel - [tip:perf/core] perf pmu: Only print Using CPUID message once

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Message-ID: <tip-fb967063699e25ae73f0991672f99bd7104f70c8@git.kernel.org>
Date:   Mon, 24 Oct 2016 12:02:50 -0700
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        ak@...ux.intel.com, eranian@...gle.com, mingo@...nel.org,
        jolsa@...nel.org, sukadev@...ux.vnet.ibm.com, acme@...hat.com
Subject: [tip:perf/core] perf pmu: Only print Using CPUID message once

Commit-ID:  fb967063699e25ae73f0991672f99bd7104f70c8
Gitweb:     http://git.kernel.org/tip/fb967063699e25ae73f0991672f99bd7104f70c8
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Thu, 13 Oct 2016 14:15:24 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 24 Oct 2016 11:07:41 -0300

perf pmu: Only print Using CPUID message once

With uncore event aliases which are duplicated over multiple PMUs the
"Using CPUID" message with -v could be printed many times.  Only print
it once.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1476393332-20732-3-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/pmu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index b1474dc..d7174f3 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -504,6 +504,7 @@ static void pmu_add_cpu_aliases(struct list_head *head)
 	struct pmu_events_map *map;
 	struct pmu_event *pe;
 	char *cpuid;
+	static bool printed;
 
 	cpuid = getenv("PERF_CPUID");
 	if (cpuid)
@@ -513,7 +514,10 @@ static void pmu_add_cpu_aliases(struct list_head *head)
 	if (!cpuid)
 		return;
 
-	pr_debug("Using CPUID %s\n", cpuid);
+	if (!printed) {
+		pr_debug("Using CPUID %s\n", cpuid);
+		printed = true;
+	}
 
 	i = 0;
 	while (1) {