xref: /linux-6.15/scripts/bootgraph.pl (revision 8bd9890e) 
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 @rows;
41my %start, %end, %row;
42my $done = 0;
43my $rowcount = 0;
44my $maxtime = 0;
45my $firsttime = 100;
46my $count = 0;
47while (<>) {
48	my $line = $_;
49	if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z0-9\_]+)\+/) {
50		my $func = $2;
51		if ($done == 0) {
52			$start{$func} = $1;
53			if ($1 < $firsttime) {
54				$firsttime = $1;
55			}
56		}
57		$row{$func} = 1;
58		if ($line =~ /\@ ([0-9]+)/) {
59			my $pid = $1;
60			if (!defined($rows[$pid])) {
61				$rowcount = $rowcount + 1;
62				$rows[$pid] = $rowcount;
63			}
64			$row{$func} = $rows[$pid];
65		}
66		$count = $count + 1;
67	}
68
69	if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_]+)\+.*returned/) {
70		if ($done == 0) {
71			$end{$2} = $1;
72			$maxtime = $1;
73		}
74	}
75	if ($line =~ /Write protecting the/) {
76		$done = 1;
77	}
78	if ($line =~ /Freeing unused kernel memory/) {
79		$done = 1;
80	}
81}
82
83if ($count == 0) {
84	print "No data found in the dmesg. Make sure that 'printk.time=1' and\n";
85	print "'initcall_debug' are passed on the kernel command line.\n\n";
86	print "Usage: \n";
87	print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
88	exit;
89}
90
91print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
92print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
93
94my @styles;
95
96$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
97$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
98$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
99$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
100$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
101$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
102$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
103$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
104$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
105$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
106$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
107$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
108
109my $mult = 950.0 / ($maxtime - $firsttime);
110my $threshold = ($maxtime - $firsttime) / 60.0;
111my $stylecounter = 0;
112while (($key,$value) = each %start) {
113	my $duration = $end{$key} - $start{$key};
114
115	if ($duration >= $threshold) {
116		my $s, $s2, $e, $y;
117		$s = ($value - $firsttime) * $mult;
118		$s2 = $s + 6;
119		$e = ($end{$key} - $firsttime) * $mult;
120		$w = $e - $s;
121
122		$y = $row{$key} * 150;
123		$y2 = $y + 4;
124
125		$style = $styles[$stylecounter];
126		$stylecounter = $stylecounter + 1;
127		if ($stylecounter > 11) {
128			$stylecounter = 0;
129		};
130
131		print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
132		print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
133	}
134}
135
136
137# print the time line on top
138my $time = $firsttime;
139my $step = ($maxtime - $firsttime) / 15;
140while ($time < $maxtime) {
141	my $s2 = ($time - $firsttime) * $mult;
142	my $tm = int($time * 100) / 100.0;
143	print "<text transform=\"translate($s2,89) rotate(90)\">$tm</text>\n";
144	$time = $time + $step;
145}
146
147print "</svg>\n";
148