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-rw-r--r--tools/perf/scripts/perl/wakeup-latency.pl12
1 files changed, 8 insertions, 4 deletions
diff --git a/tools/perf/scripts/perl/wakeup-latency.pl b/tools/perf/scripts/perl/wakeup-latency.pl
index ed58ef284e23..d9143dcec6c6 100644
--- a/tools/perf/scripts/perl/wakeup-latency.pl
+++ b/tools/perf/scripts/perl/wakeup-latency.pl
@@ -22,8 +22,8 @@ my %last_wakeup;
my $max_wakeup_latency;
my $min_wakeup_latency;
-my $total_wakeup_latency;
-my $total_wakeups;
+my $total_wakeup_latency = 0;
+my $total_wakeups = 0;
sub sched::sched_switch
{
@@ -67,8 +67,12 @@ sub trace_end
{
printf("wakeup_latency stats:\n\n");
print "total_wakeups: $total_wakeups\n";
- printf("avg_wakeup_latency (ns): %u\n",
- avg($total_wakeup_latency, $total_wakeups));
+ if ($total_wakeups) {
+ printf("avg_wakeup_latency (ns): %u\n",
+ avg($total_wakeup_latency, $total_wakeups));
+ } else {
+ printf("avg_wakeup_latency (ns): N/A\n");
+ }
printf("min_wakeup_latency (ns): %u\n", $min_wakeup_latency);
printf("max_wakeup_latency (ns): %u\n", $max_wakeup_latency);