linux-kernel - [PATCH 02/10] perf, tools: Only print Using CPUID message once

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Date:   Thu, 13 Oct 2016 14:15:24 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, sukadev@...ux.vnet.ibm.com, eranian@...gle.com,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 02/10] perf, tools: Only print Using CPUID message once

From: Andi Kleen <ak@...ux.intel.com>

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>
---
 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 9adae7e7477c..b36bf9e77799 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -508,6 +508,7 @@ 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)
@@ -517,7 +518,10 @@ 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) {
-- 
2.5.5