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    Subject[PATCH 2/2] cstate ftrace userland script
    and here's a script to turn the cstate ftrace output into a nice SVG
    that you can view with inkscape

    #!/usr/bin/perl

    # Copyright 2008, Intel Corporation
    #
    # This file is part of the Linux kernel
    #
    # This program file is free software; you can redistribute it and/or modify it
    # under the terms of the GNU General Public License as published by the
    # Free Software Foundation; version 2 of the License.
    #
    # This program is distributed in the hope that it will be useful, but WITHOUT
    # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
    # for more details.
    #
    # You should have received a copy of the GNU General Public License
    # along with this program in a file named COPYING; if not, write to the
    # Free Software Foundation, Inc.,
    # 51 Franklin Street, Fifth Floor,
    # Boston, MA 02110-1301 USA
    #
    # Authors:
    # Arjan van de Ven <arjan@linux.intel.com>


    #
    # This script turns a cstate ftrace output into a SVG graphic that shows
    # historic C-state information
    #
    #
    # cat /sys/kernel/debug/tracer/trace | perl cstate.pl > out.svg
    #

    my @rows;
    my @styles;
    my $base = 0;


    $styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    $styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
    my $stylecounter = 0;


    print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
    print "<svg width=\"10000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";

    my $scale = 30000.0;
    while (<>) {
    my $line = $_;
    if ($line =~ /([0-9\.]+)\] Going to C([0-9]) on cpu ([0-9]+) for ([0-9\.]+)/) {
    # if ($line =~ /([0-9\.]+)\] Going to C([0-9]) /) {
    if ($base == 0) {
    $base = $1;
    }
    my $time = $1 - $base;
    my $time = $time * $scale;
    my $C = $2;
    my $cpu = $3;
    my $y = 200 * $cpu;
    my $duration = $4 * $scale;
    my $msec = int($4 * 100000)/100.0;
    my $height = $C * 20;
    $style = $styles[$C];

    $y = $y + 140 - $height;

    $x2 = $time + 4;
    $y2 = $y + 4;


    print "<rect x=\"$time\" width=\"$duration\" y=\"$y\" height=\"$height\" style=\"$style\"/>\n";
    print "<text transform=\"translate($x2,$y2) rotate(90)\">C$C $msec</text>\n";
    }
    }


    print "</svg>\n";


    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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