#!/usr/bin/perl -w
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# SPDX-License-Identifier: GPL-2.0-only
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# (c) 2009, Tom Zanussi <tzanussi@gmail.com>
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# Display avg/min/max wakeup latency
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# The common_* event handler fields are the most useful fields common to
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# all events. They don't necessarily correspond to the 'common_*' fields
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# in the status files. Those fields not available as handler params can
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# be retrieved via script functions of the form get_common_*().
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use 5.010000;
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use strict;
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use warnings;
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use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
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use lib "./Perf-Trace-Util/lib";
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use Perf::Trace::Core;
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use Perf::Trace::Util;
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my %last_wakeup;
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my $max_wakeup_latency;
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my $min_wakeup_latency;
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my $total_wakeup_latency = 0;
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my $total_wakeups = 0;
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sub sched::sched_switch
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain,
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$prev_comm, $prev_pid, $prev_prio, $prev_state, $next_comm, $next_pid,
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$next_prio) = @_;
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my $wakeup_ts = $last_wakeup{$common_cpu}{ts};
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if ($wakeup_ts) {
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my $switch_ts = nsecs($common_secs, $common_nsecs);
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my $wakeup_latency = $switch_ts - $wakeup_ts;
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if ($wakeup_latency > $max_wakeup_latency) {
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$max_wakeup_latency = $wakeup_latency;
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}
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if ($wakeup_latency < $min_wakeup_latency) {
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$min_wakeup_latency = $wakeup_latency;
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}
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$total_wakeup_latency += $wakeup_latency;
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$total_wakeups++;
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}
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$last_wakeup{$common_cpu}{ts} = 0;
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}
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sub sched::sched_wakeup
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain,
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$comm, $pid, $prio, $success, $target_cpu) = @_;
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$last_wakeup{$target_cpu}{ts} = nsecs($common_secs, $common_nsecs);
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}
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sub trace_begin
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{
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$min_wakeup_latency = 1000000000;
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$max_wakeup_latency = 0;
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}
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sub trace_end
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{
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printf("wakeup_latency stats:\n\n");
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print "total_wakeups: $total_wakeups\n";
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if ($total_wakeups) {
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printf("avg_wakeup_latency (ns): %u\n",
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avg($total_wakeup_latency, $total_wakeups));
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} else {
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printf("avg_wakeup_latency (ns): N/A\n");
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}
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printf("min_wakeup_latency (ns): %u\n", $min_wakeup_latency);
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printf("max_wakeup_latency (ns): %u\n", $max_wakeup_latency);
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print_unhandled();
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}
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my %unhandled;
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sub print_unhandled
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{
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if ((scalar keys %unhandled) == 0) {
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return;
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}
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print "\nunhandled events:\n\n";
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printf("%-40s %10s\n", "event", "count");
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printf("%-40s %10s\n", "----------------------------------------",
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"-----------");
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foreach my $event_name (keys %unhandled) {
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printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
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}
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}
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sub trace_unhandled
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain) = @_;
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$unhandled{$event_name}++;
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}
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