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#!/usr/bin/perl -w
#
# stackcollapse-stap.pl collapse multiline SystemTap stacks
# into single lines.
#
# Parses a multiline stack followed by a number on a separate line, and
# outputs a semicolon separated stack followed by a space and the number.
# If memory addresses (+0xd) are present, they are stripped, and resulting
# identical stacks are colased with their counts summed.
#
# USAGE: ./stackcollapse.pl infile > outfile
#
# Example input:
#
# 0xffffffff8103ce3b : native_safe_halt+0xb/0x10 [kernel]
# 0xffffffff8101c6a3 : default_idle+0x53/0x1d0 [kernel]
# 0xffffffff81013236 : cpu_idle+0xd6/0x120 [kernel]
# 0xffffffff815bf03e : rest_init+0x72/0x74 [kernel]
# 0xffffffff81aebbfe : start_kernel+0x3ba/0x3c5 [kernel]
# 2404
#
# Example output:
#
# start_kernel;rest_init;cpu_idle;default_idle;native_safe_halt 2404
#
# Input may contain many stacks as generated from SystemTap.
#
# Copyright 2011 Joyent, Inc. All rights reserved.
# Copyright 2011 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
#
# 16-Feb-2012 Brendan Gregg Created this.
use strict;
my %collapsed;
sub remember_stack {
my ($stack, $count) = @_;
$collapsed{$stack} += $count;
}
my @stack;
foreach (<>) {
chomp;
if (m/^\s*(\d+)+$/) {
remember_stack(join(";", @stack), $1);
@stack = ();
next;
}
next if (m/^\s*$/);
my $frame = $_;
$frame =~ s/^\s*//;
$frame =~ s/\+[^+]*$//;
$frame =~ s/.* : //;
$frame = "-" if $frame eq "";
unshift @stack, $frame;
}
foreach my $k (sort { $a cmp $b } keys %collapsed) {
printf "$k $collapsed{$k}\n";
}
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