scripts/bootgraph.pl

   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
  40 use strict;
  41
  42 my %start;
  43 my %end;
  44 my $done = 0;
  45 my $maxtime = 0;
  46 my $firsttime = 100;
  47 my $count = 0;
  48 my %pids;
  49
  50 while (<>) {
  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                 $done = 1;
  77         }
  78 }
  79
  80 if ($count == 0) {
  81     print STDERR <<END;
  82 No data found in the dmesg. Make sure that 'printk.time=1' and
  83 'initcall_debug' are passed on the kernel command line.
  84 Usage:
  85       dmesg | perl scripts/bootgraph.pl > output.svg
  86 END
  87     exit 1;
  88 }
  89
  90 print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
  91 print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
  92
  93 my @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
 108 my $mult = 950.0 / ($maxtime - $firsttime);
 109 my $threshold = ($maxtime - $firsttime) / 60.0;
 110 my $stylecounter = 0;
 111 my %rows;
 112 my $rowscount = 1;
 113 my @initcalls = sort { $start{$a} <=> $start{$b} } keys(%start);
 114
 115 foreach my $key (@initcalls) {
 116         my $duration = $end{$key} - $start{$key};
 117
 118         if ($duration >= $threshold) {
 119                 my ($s, $s2, $e, $w, $y, $y2, $style);
 120                 my $pid = $pids{$key};
 121
 122                 if (!defined($rows{$pid})) {
 123                         $rows{$pid} = $rowscount;
 124                         $rowscount = $rowscount + 1;
 125                 }
 126                 $s = ($start{$key} - $firsttime) * $mult;
 127                 $s2 = $s + 6;
 128                 $e = ($end{$key} - $firsttime) * $mult;
 129                 $w = $e - $s;
 130
 131                 $y = $rows{$pid} * 150;
 132                 $y2 = $y + 4;
 133
 134                 $style = $styles[$stylecounter];
 135                 $stylecounter = $stylecounter + 1;
 136                 if ($stylecounter > 11) {
 137                         $stylecounter = 0;
 138                 };
 139
 140                 print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
 141                 print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
 142         }
 143 }
 144
 145
 146 # print the time line on top
 147 my $time = $firsttime;
 148 my $step = ($maxtime - $firsttime) / 15;
 149 while ($time < $maxtime) {
 150         my $s3 = ($time - $firsttime) * $mult;
 151         my $tm = int($time * 100) / 100.0;
 152         print "<text transform=\"translate($s3,89) rotate(90)\">$tm</text>\n";
 153         $time = $time + $step;
 154 }
 155
 156 print "</svg>\n";