stackcollapse-perf.pl

#!/usr/bin/perl -w
#
# stackcolllapse-perf.pl	collapse perf samples into single lines.
#
# Parses a list of multiline stacks generated by "perf script", and
# outputs a semicolon separated stack followed by a space and a count.
# If memory addresses (+0xd) are present, they are stripped, and resulting
# identical stacks are colased with their counts summed.
#
# USAGE: ./stackcollapse-perf.pl infile > outfile
#
# Example input:
#
#  swapper     0 [000] 158665.570607: cpu-clock: 
#         ffffffff8103ce3b native_safe_halt ([kernel.kallsyms])
#         ffffffff8101c6a3 default_idle ([kernel.kallsyms])
#         ffffffff81013236 cpu_idle ([kernel.kallsyms])
#         ffffffff815bf03e rest_init ([kernel.kallsyms])
#         ffffffff81aebbfe start_kernel ([kernel.kallsyms].init.text)
#  [...]
#
# Example output:
#
#  start_kernel;rest_init;cpu_idle;default_idle;native_safe_halt 1
#
# Input may be created and processed using:
#
#  perf record -a -g -F 997 sleep 60
#  perf script | ./stackcollapse-perf.pl > out.stacks-folded
#
# Copyright 2012 Joyent, Inc.  All rights reserved.
# Copyright 2012 Brendan Gregg.  All rights reserved.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at docs/cddl1.txt or
# http://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at docs/cddl1.txt.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
# 02-Mar-2012	Brendan Gregg	Created this.

use strict;

my %collapsed;

sub remember_stack {
	my ($stack, $count) = @_;
	$collapsed{$stack} += $count;
}

my @stack;

foreach (<>) {
	next if m/^#/;
	chomp;

	if (m/^$/) {
		remember_stack(join(";", @stack), 1) if @stack;
		undef @stack;
		next;
	}

	# Note the details skipped below, and customize as desired

	if (m/:.*:\s$/) {
		# skip summary lines
		next;
	}

	if (/^\s*\w+\s*(.+) (\S+)/) {
		my ($func, $mod) = ($1, $2);
		next if $func =~ /^\(/;		# skip process names
		unshift @stack, $func;
	} else {
		warn "Unrecognized line: $_";
	}
}

foreach my $k (sort { $a cmp $b } keys %collapsed) {
	printf "$k $collapsed{$k}\n";
}