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#!/usr/bin/perl -w
#
# pkgsplit-perf.pl Split IP samples on package names "/", eg, Java.
#
# This is for the creation of Java package flame graphs. Example steps:
#
# perf record -F 199 -a -- sleep 30; ./jmaps
# perf script | ./pkgsplit-perf.pl | ./flamegraph.pl > out.svg
#
# Note that stack traces are not sampled (no -g), as we split Java package
# names into frames rather than stack frames.
#
# (jmaps is a helper script for automating perf-map-agent: Java symbol dumps.)
#
# The default output of "perf script" varies between kernel versions, so we'll
# need to deal with that here. I could make people use the perf script option
# to pick fields, so our input is static, but A) I prefer the simplicity of
# just saying: run "perf script", and B) the option to choose fields itself
# changed between kernel versions! -f became -F.
#
# Copyright 2017 Netflix, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 20-Sep-2016 Brendan Gregg Created this.
use strict;
my $include_pname = 1; # include process names in stacks
my $include_pid = 0; # include process ID with process name
my $include_tid = 0; # include process & thread ID with process name
while (<>) {
# filter comments
next if /^#/;
# filter idle events
next if /xen_hypercall_sched_op|cpu_idle|native_safe_halt/;
my ($pid, $tid, $pname);
# Linux 3.13:
# java 13905 [000] 8048.096572: cpu-clock: 7fd781ac3053 Ljava/util/Arrays$ArrayList;::toArray (/tmp/perf-12149.map)
# java 8301 [050] 13527.392454: cycles: 7fa8a80d9bff Dictionary::find(int, unsigned int, Symbol*, ClassLoaderData*, Handle, Thread*) (/usr/lib/jvm/java-8-oracle-1.8.0.121/jre/lib/amd64/server/libjvm.so)
# java 4567/8603 [023] 13527.389886: cycles: 7fa863349895 Lcom/google/gson/JsonObject;::add (/tmp/perf-4567.map)
#
# Linux 4.8:
# java 30894 [007] 452884.077440: 10101010 cpu-clock: 7f0acc8eff67 Lsun/nio/ch/SocketChannelImpl;::read+0x27 (/tmp/perf-30849.map)
# bash 26858/26858 [006] 5440237.995639: cpu-clock: 433573 [unknown] (/bin/bash)
#
if (/^\s+(\S.+?)\s+(\d+)\/*(\d+)*\s.*?:.*:/) {
# parse process name and pid/tid
if ($3) {
($pid, $tid) = ($2, $3);
} else {
($pid, $tid) = ("?", $2);
}
if ($include_tid) {
$pname = "$1-$pid/$tid";
} elsif ($include_pid) {
$pname = "$1-$pid";
} else {
$pname = $1;
}
$pname =~ tr/ /_/;
} else {
# not a match
next;
}
# parse rest of line
s/^.*?:.*?:\s+//;
s/ \(.*?\)$//;
chomp;
my ($addr, $func) = split(' ', $_, 2);
# strip Java's leading "L"
$func =~ s/^L//;
# replace numbers with X
$func =~ s/[0-9]/X/g;
# colon delimitered
$func =~ s:/:;:g;
print "$pname;$func 1\n";
}
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