perf trace: Add perf trace scripting support modules for Perl
Add Perf-Trace-Util Perl module and some scripts that use it.
Core.pm contains Perl code to define and access flag and
symbolic fields. Util.pm contains general-purpose utility
functions.
Also adds some makefile bits to install them in
libexec/perf-core/scripts/perl (or wherever perfexec_instdir
points).
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-5-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/scripts/perl/wakeup-latency.pl b/tools/perf/scripts/perl/wakeup-latency.pl
new file mode 100644
index 0000000..ed58ef2
--- /dev/null
+++ b/tools/perf/scripts/perl/wakeup-latency.pl
@@ -0,0 +1,103 @@
+#!/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;
+my $total_wakeups;
+
+sub sched::sched_switch
+{
+ my ($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: $total_wakeups\n";
+ printf("avg_wakeup_latency (ns): %u\n",
+ avg($total_wakeup_latency, $total_wakeups));
+ 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}++;
+}