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authorArjan van de Ven <arjan@linux.intel.com>2008-09-13 12:36:06 -0400
committerArjan van de Ven <arjan@linux.intel.com>2008-10-12 11:07:20 -0400
commitf9b9796ade7609cd62571d38f064e20c77d31281 (patch)
treeab108882f8bb940a4a3c2cc483223fb6791bb473 /scripts
parent7cc4e87f912bbefa440a51856b8d076e5d1f554a (diff)
Add a script to visualize the kernel boot process / time
When optimizing the kernel boot time, it's very valuable to visualize what is going on at which time. In addition, with some of the initializing going asynchronous soon, it's valuable to track/print which worker thread is executing the initialization. This patch adds a script to turn a dmesg into a SVG graph (that can be shown with tools such as InkScape, Gimp or Firefox) and a small change to the initcall code to print the PID of the thread calling the initcall (so that the script can work out the parallelism). Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/bootgraph.pl138
1 files changed, 138 insertions, 0 deletions
diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
new file mode 100644
index 000000000000..d459b8bdef02
--- /dev/null
+++ b/scripts/bootgraph.pl
@@ -0,0 +1,138 @@
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 <arjan@linux.intel.com>
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 $count = 0;
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 $row{$func} = 1;
54 if ($line =~ /\@ ([0-9]+)/) {
55 my $pid = $1;
56 if (!defined($rows[$pid])) {
57 $rowcount = $rowcount + 1;
58 $rows[$pid] = $rowcount;
59 }
60 $row{$func} = $rows[$pid];
61 }
62 $count = $count + 1;
63 }
64
65 if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z\_]+)\+.*returned/) {
66 if ($done == 0) {
67 $end{$2} = $1;
68 $maxtime = $1;
69 }
70 }
71 if ($line =~ /Write protecting the/) {
72 $done = 1;
73 }
74}
75
76if ($count == 0) {
77 print "No data found in the dmesg. Make sure CONFIG_PRINTK_TIME is enabled and\n";
78 print "that initcall_debug is passed on the kernel command line.\n\n";
79 print "Usage: \n";
80 print " dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
81 exit;
82}
83
84print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
85print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
86
87my @styles;
88
89$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
90$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
91$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
92$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
93$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
94$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
95$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
96$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
97$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
98$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
99$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
100$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
101
102my $mult = 950.0 / $maxtime;
103my $threshold = 0.0500 / $maxtime;
104my $stylecounter = 0;
105while (($key,$value) = each %start) {
106 my $duration = $end{$key} - $start{$key};
107
108 if ($duration >= $threshold) {
109 my $s, $s2, $e, $y;
110 $s = $value * $mult;
111 $s2 = $s + 6;
112 $e = $end{$key} * $mult;
113 $w = $e - $s;
114
115 $y = $row{$key} * 150;
116 $y2 = $y + 4;
117
118 $style = $styles[$stylecounter];
119 $stylecounter = $stylecounter + 1;
120 if ($stylecounter > 11) {
121 $stylecounter = 0;
122 };
123
124 print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
125 print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
126 }
127}
128
129
130# print the time line on top
131my $time = 0.0;
132while ($time < $maxtime) {
133 my $s2 = $time * $mult;
134 print "<text transform=\"translate($s2,89) rotate(90)\">$time</text>\n";
135 $time = $time + 0.1;
136}
137
138print "</svg>\n";