Some minor fixes for the wakeup-latency script:
- Fix nuisance 'use of uninitialized value' warnings
- Avoid divide-by-zero error
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <
1273466820-9330-5-git-send-email-tzanussi@gmail.com>
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
my $max_wakeup_latency;
my $min_wakeup_latency;
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
{
sub sched::sched_switch
{
{
printf("wakeup_latency stats:\n\n");
print "total_wakeups: $total_wakeups\n";
{
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);
printf("min_wakeup_latency (ns): %u\n", $min_wakeup_latency);
printf("max_wakeup_latency (ns): %u\n", $max_wakeup_latency);