xref: /linux-6.15/scripts/bootgraph.pl (revision 40c8c85a) 
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
40use strict;
41
42my %start;
43my %end;
44my $done = 0;
45my $maxtime = 0;
46my $firsttime = 100;
47my $count = 0;
48my %pids;
49
50while (<>) {
51	my $line = $_;
52	if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z0-9\_]+)\+/) {
53		my $func = $2;
54		if ($done == 0) {
55			$start{$func} = $1;
56			if ($1 < $firsttime) {
57				$firsttime = $1;
58			}
59		}
60		if ($line =~ /\@ ([0-9]+)/) {
61			$pids{$func} = $1;
62		}
63		$count = $count + 1;
64	}
65
66	if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_]+)\+.*returned/) {
67		if ($done == 0) {
68			$end{$2} = $1;
69			$maxtime = $1;
70		}
71	}
72	if ($line =~ /Write protecting the/) {
73		$done = 1;
74	}
75	if ($line =~ /Freeing unused kernel memory/) {
76		$done = 1;
77	}
78}
79
80if ($count == 0) {
81    print STDERR <<END;
82No data found in the dmesg. Make sure that 'printk.time=1' and
83'initcall_debug' are passed on the kernel command line.
84Usage:
85      dmesg | perl scripts/bootgraph.pl > output.svg
86END
87    exit 1;
88}
89
90print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
91print "<svg width=\"2000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
92
93my @styles;
94
95$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
96$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
97$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
98$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
99$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
100$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
101$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
102$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
103$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
104$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
105$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
106$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
107
108my $mult = 1950.0 / ($maxtime - $firsttime);
109my $threshold2 = ($maxtime - $firsttime) / 120.0;
110my $threshold = $threshold2/10;
111my $stylecounter = 0;
112my %rows;
113my $rowscount = 1;
114my @initcalls = sort { $start{$a} <=> $start{$b} } keys(%start);
115
116foreach my $key (@initcalls) {
117	my $duration = $end{$key} - $start{$key};
118
119	if ($duration >= $threshold) {
120		my ($s, $s2, $s3, $e, $w, $y, $y2, $style);
121		my $pid = $pids{$key};
122
123		if (!defined($rows{$pid})) {
124			$rows{$pid} = $rowscount;
125			$rowscount = $rowscount + 1;
126		}
127		$s = ($start{$key} - $firsttime) * $mult;
128		$s2 = $s + 6;
129		$s3 = $s + 1;
130		$e = ($end{$key} - $firsttime) * $mult;
131		$w = $e - $s;
132
133		$y = $rows{$pid} * 150;
134		$y2 = $y + 4;
135
136		$style = $styles[$stylecounter];
137		$stylecounter = $stylecounter + 1;
138		if ($stylecounter > 11) {
139			$stylecounter = 0;
140		};
141
142		print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
143		if ($duration >= $threshold2) {
144			print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
145		} else {
146			print "<text transform=\"translate($s3,$y2) rotate(90)\" font-size=\"3pt\">$key</text>\n";
147		}
148	}
149}
150
151
152# print the time line on top
153my $time = $firsttime;
154my $step = ($maxtime - $firsttime) / 15;
155while ($time < $maxtime) {
156	my $s3 = ($time - $firsttime) * $mult;
157	my $tm = int($time * 100) / 100.0;
158	print "<text transform=\"translate($s3,89) rotate(90)\">$tm</text>\n";
159	$time = $time + $step;
160}
161
162print "</svg>\n";
163