#!/usr/bin/perl

# Copyright 2008, Intel Corporation
#
# This file is part of the Linux kernel
#
# This program file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program in a file named COPYING; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301 USA
#
# Authors:
# 	Arjan van de Ven 


#
# This script turns a dmesg output into a SVG graphic that shows which
# functions take how much time. You can view SVG graphics with various
# programs, including Inkscape, The Gimp and Firefox.
#
#
# For this script to work, the kernel needs to be compiled with the
# CONFIG_PRINTK_TIME configuration option enabled, and with
# "initcall_debug" passed on the kernel command line.
#
# usage:
# 	dmesg | perl scripts/bootgraph.pl > output.svg
#

use strict;

my %start;
my %end;
my %type;
my $done = 0;
my $maxtime = 0;
my $firsttime = 100;
my $count = 0;
my %pids;
my %pidctr;

while () {
	my $line = $_;
	if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z0-9\_\.]+)\+/) {
		my $func = $2;
		if ($done == 0) {
			$start{$func} = $1;
			$type{$func} = 0;
			if ($1 < $firsttime) {
				$firsttime = $1;
			}
		}
		if ($line =~ /\@ ([0-9]+)/) {
			$pids{$func} = $1;
		}
		$count = $count + 1;
	}

	if ($line =~ /([0-9\.]+)\] async_waiting @ ([0-9]+)/) {
		my $pid = $2;
		my $func;
		if (!defined($pidctr{$pid})) {
			$func = "wait_" . $pid . "_1";
			$pidctr{$pid} = 1;
		} else {
			$pidctr{$pid} = $pidctr{$pid} + 1;
			$func = "wait_" . $pid . "_" . $pidctr{$pid};
		}
		if ($done == 0) {
			$start{$func} = $1;
			$type{$func} = 1;
			if ($1 < $firsttime) {
				$firsttime = $1;
			}
		}
		$pids{$func} = $pid;
		$count = $count + 1;
	}

	if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_\.]+)\+.*returned/) {
		if ($done == 0) {
			$end{$2} = $1;
			$maxtime = $1;
		}
	}

	if ($line =~ /([0-9\.]+)\] async_continuing @ ([0-9]+)/) {
		my $pid = $2;
		my $func =  "wait_" . $pid . "_" . $pidctr{$pid};
		$end{$func} = $1;
		$maxtime = $1;
	}
	if ($line =~ /Write protecting the/) {
		$done = 1;
	}
	if ($line =~ /Freeing unused kernel memory/) {
		$done = 1;
	}
}

if ($count == 0) {
    print STDERR = $threshold) {
		my ($s, $s2, $s3, $e, $w, $y, $y2, $style);
		my $pid = $pids{$key};

		if (!defined($rows{$pid})) {
			$rows{$pid} = $rowscount;
			$rowscount = $rowscount + 1;
		}
		$s = ($start{$key} - $firsttime) * $mult;
		$s2 = $s + 6;
		$s3 = $s + 1;
		$e = ($end{$key} - $firsttime) * $mult;
		$w = $e - $s;

		$y = $rows{$pid} * 150;
		$y2 = $y + 4;

		$style = $styles[$stylecounter];
		$stylecounter = $stylecounter + 1;
		if ($stylecounter > 11) {
			$stylecounter = 0;
		};

		if ($type{$key} == 1) {
			$y = $y + 15;
			print "\n";
		} else {
			print "\n";
			if ($duration >= $threshold2) {
				print "$key\n";
			} else {
				print "$key\n";
			}
		}
	}
}


# print the time line on top
my $time = $firsttime;
my $step = ($maxtime - $firsttime) / 15;
while ($time < $maxtime) {
	my $s3 = ($time - $firsttime) * $mult;
	my $tm = int($time * 100) / 100.0;
	print "$tm\n";
	$time = $time + $step;
}

print "\n";