mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
e366728d57
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>
108 lines
2.7 KiB
Perl
108 lines
2.7 KiB
Perl
#!/usr/bin/perl -w
|
|
# (c) 2009, Tom Zanussi <tzanussi@gmail.com>
|
|
# Licensed under the terms of the GNU GPL License version 2
|
|
|
|
# Display avg/min/max wakeup latency
|
|
|
|
# The common_* event handler fields are the most useful fields common to
|
|
# all events. They don't necessarily correspond to the 'common_*' fields
|
|
# in the status files. Those fields not available as handler params can
|
|
# be retrieved via script functions of the form get_common_*().
|
|
|
|
use 5.010000;
|
|
use strict;
|
|
use warnings;
|
|
|
|
use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
|
|
use lib "./Perf-Trace-Util/lib";
|
|
use Perf::Trace::Core;
|
|
use Perf::Trace::Util;
|
|
|
|
my %last_wakeup;
|
|
|
|
my $max_wakeup_latency;
|
|
my $min_wakeup_latency;
|
|
my $total_wakeup_latency = 0;
|
|
my $total_wakeups = 0;
|
|
|
|
sub sched::sched_switch
|
|
{
|
|
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
|
$common_pid, $common_comm,
|
|
$prev_comm, $prev_pid, $prev_prio, $prev_state, $next_comm, $next_pid,
|
|
$next_prio) = @_;
|
|
|
|
my $wakeup_ts = $last_wakeup{$common_cpu}{ts};
|
|
if ($wakeup_ts) {
|
|
my $switch_ts = nsecs($common_secs, $common_nsecs);
|
|
my $wakeup_latency = $switch_ts - $wakeup_ts;
|
|
if ($wakeup_latency > $max_wakeup_latency) {
|
|
$max_wakeup_latency = $wakeup_latency;
|
|
}
|
|
if ($wakeup_latency < $min_wakeup_latency) {
|
|
$min_wakeup_latency = $wakeup_latency;
|
|
}
|
|
$total_wakeup_latency += $wakeup_latency;
|
|
$total_wakeups++;
|
|
}
|
|
$last_wakeup{$common_cpu}{ts} = 0;
|
|
}
|
|
|
|
sub sched::sched_wakeup
|
|
{
|
|
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
|
$common_pid, $common_comm,
|
|
$comm, $pid, $prio, $success, $target_cpu) = @_;
|
|
|
|
$last_wakeup{$target_cpu}{ts} = nsecs($common_secs, $common_nsecs);
|
|
}
|
|
|
|
sub trace_begin
|
|
{
|
|
$min_wakeup_latency = 1000000000;
|
|
$max_wakeup_latency = 0;
|
|
}
|
|
|
|
sub trace_end
|
|
{
|
|
printf("wakeup_latency stats:\n\n");
|
|
print "total_wakeups: $total_wakeups\n";
|
|
if ($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);
|
|
|
|
print_unhandled();
|
|
}
|
|
|
|
my %unhandled;
|
|
|
|
sub print_unhandled
|
|
{
|
|
if ((scalar keys %unhandled) == 0) {
|
|
return;
|
|
}
|
|
|
|
print "\nunhandled events:\n\n";
|
|
|
|
printf("%-40s %10s\n", "event", "count");
|
|
printf("%-40s %10s\n", "----------------------------------------",
|
|
"-----------");
|
|
|
|
foreach my $event_name (keys %unhandled) {
|
|
printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
|
|
}
|
|
}
|
|
|
|
sub trace_unhandled
|
|
{
|
|
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
|
|
$common_pid, $common_comm) = @_;
|
|
|
|
$unhandled{$event_name}++;
|
|
}
|