xref: /linux-6.15/scripts/bootgraph.pl (revision ddc7a01a) 
1#!/usr/bin/perl
2
3# Copyright 2008, Intel Corporation
4#
5# This file is part of the Linux kernel
6#
7# This program file is free software; you can redistribute it and/or modify it
8# under the terms of the GNU General Public License as published by the
9# Free Software Foundation; version 2 of the License.
10#
11# This program is distributed in the hope that it will be useful, but WITHOUT
12# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14# for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program in a file named COPYING; if not, write to the
18# Free Software Foundation, Inc.,
19# 51 Franklin Street, Fifth Floor,
20# Boston, MA 02110-1301 USA
21#
22# Authors:
23# 	Arjan van de Ven <[email protected]>
24
25
26#
27# This script turns a dmesg output into a SVG graphic that shows which
28# functions take how much time. You can view SVG graphics with various
29# programs, including Inkscape, The Gimp and Firefox.
30#
31#
32# For this script to work, the kernel needs to be compiled with the
33# CONFIG_PRINTK_TIME configuration option enabled, and with
34# "initcall_debug" passed on the kernel command line.
35#
36# usage:
37# 	dmesg | perl scripts/bootgraph.pl > output.svg
38#
39
40my %start, %end;
41my $done = 0;
42my $maxtime = 0;
43my $count = 0;
44my %pids;
45
46while (<>) {
47	my $line = $_;
48	if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z\_]+)\+/) {
49		my $func = $2;
50		if ($done == 0) {
51			$start{$func} = $1;
52		}
53		if ($line =~ /\@ ([0-9]+)/) {
54			$pids{$func} = $1;
55		}
56		$count = $count + 1;
57	}
58
59	if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z\_]+)\+.*returned/) {
60		if ($done == 0) {
61			$end{$2} = $1;
62			$maxtime = $1;
63		}
64	}
65	if ($line =~ /Write protecting the/) {
66		$done = 1;
67	}
68}
69
70if ($count == 0) {
71	print "No data found in the dmesg. Make sure CONFIG_PRINTK_TIME is enabled and\n";
72	print "that initcall_debug is passed on the kernel command line.\n\n";
73	print "Usage: \n";
74	print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
75	exit;
76}
77
78print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
79print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
80
81my @styles;
82
83$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
84$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
85$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
86$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
87$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
88$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
89$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
90$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
91$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
92$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
93$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
94$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
95
96my $mult = 950.0 / $maxtime;
97my $threshold = 0.0500 / $maxtime;
98my $stylecounter = 0;
99my %rows;
100my $rowscount = 1;
101while (($key,$value) = each %start) {
102	my $duration = $end{$key} - $start{$key};
103
104	if ($duration >= $threshold) {
105		my $s, $s2, $e, $y;
106		$pid = $pids{$key};
107
108		if (!defined($rows{$pid})) {
109			$rows{$pid} = $rowscount;
110			$rowscount = $rowscount + 1;
111		}
112		$s = ($value - $firsttime) * $mult;
113		$s2 = $s + 6;
114		$e = $end{$key} * $mult;
115		$w = $e - $s;
116
117		$y = $rows{$pid} * 150;
118		$y2 = $y + 4;
119
120		$style = $styles[$stylecounter];
121		$stylecounter = $stylecounter + 1;
122		if ($stylecounter > 11) {
123			$stylecounter = 0;
124		};
125
126		print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
127		print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
128	}
129}
130
131
132# print the time line on top
133my $time = 0.0;
134while ($time < $maxtime) {
135	my $s2 = $time * $mult;
136	print "<text transform=\"translate($s2,89) rotate(90)\">$time</text>\n";
137	$time = $time + 0.1;
138}
139
140print "</svg>\n";
141