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| author | Tom Zanussi <tzanussi@gmail.com> | 2010-05-10 08:46:55 +0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-05-11 02:50:57 +0400 |
| commit | e366728d57cb8c708f76b282ae194c6044355b5f (patch) | |
| tree | 0a9229172640214241a5b69c49b5655709b204d8 | |
| parent | e88a4bfbcda440b1c6b9d5a31a554a6ad9686182 (diff) | |
| download | linux-e366728d57cb8c708f76b282ae194c6044355b5f.tar.xz | |
perf/trace/scripting: wakeup-latency script cleanup
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>
| -rw-r--r-- | tools/perf/scripts/perl/wakeup-latency.pl | 12 |
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); |