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 my %start, %end;
  41 my $done = 0;
  42 my $maxtime = 0;
  43 my $count = 0;
  44 my %pids;
  45
  46 while (<>) {
  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                 $done = 1;
  67         }
  68 }
  69
  70 if ($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
  78 print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
  79 print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
  80
  81 my @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
  96 my $mult = 950.0 / $maxtime;
  97 my $threshold = 0.0500 / $maxtime;
  98 my $stylecounter = 0;
  99 my %rows;
 100 my $rowscount = 1;
 101 while (($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
 133 my $time = 0.0;
 134 while ($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
 140 print "</svg>\n";