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authorArjan van de Ven <arjan@infradead.org>2008-11-23 19:49:58 -0500
committerIngo Molnar <mingo@elte.hu>2008-11-26 02:29:32 -0500
commitf3f47a6768a29448866da4422b6f6bee485c947f (patch)
treeba4bf1b79cbd13412871eec50250294d7140fd09 /scripts/trace
parent509dceef6470442d8c7b8a43ec34125205840b3c (diff)
tracing: add "power-tracer": C/P state tracer to help power optimization
Impact: new "power-tracer" ftrace plugin This patch adds a C/P-state ftrace plugin that will generate detailed statistics about the C/P-states that are being used, so that we can look at detailed decisions that the C/P-state code is making, rather than the too high level "average" that we have today. An example way of using this is: mount -t debugfs none /sys/kernel/debug echo cstate > /sys/kernel/debug/tracing/current_tracer echo 1 > /sys/kernel/debug/tracing/tracing_enabled sleep 1 echo 0 > /sys/kernel/debug/tracing/tracing_enabled cat /sys/kernel/debug/tracing/trace | perl scripts/trace/cstate.pl > out.svg Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'scripts/trace')
-rw-r--r--scripts/trace/power.pl108
1 files changed, 108 insertions, 0 deletions
diff --git a/scripts/trace/power.pl b/scripts/trace/power.pl
new file mode 100644
index 000000000000..4f729b3501e0
--- /dev/null
+++ b/scripts/trace/power.pl
@@ -0,0 +1,108 @@
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 cstate ftrace output into a SVG graphic that shows
28# historic C-state information
29#
30#
31# cat /sys/kernel/debug/tracing/trace | perl power.pl > out.svg
32#
33
34my @styles;
35my $base = 0;
36
37my @pstate_last;
38my @pstate_level;
39
40$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
41$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
42$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
43$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
44$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
45$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
46$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
47$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
48$styles[8] = "fill:rgb(0,25,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
49
50
51print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
52print "<svg width=\"10000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
53
54my $scale = 30000.0;
55while (<>) {
56 my $line = $_;
57 if ($line =~ /([0-9\.]+)\] CSTATE: Going to C([0-9]) on cpu ([0-9]+) for ([0-9\.]+)/) {
58 if ($base == 0) {
59 $base = $1;
60 }
61 my $time = $1 - $base;
62 $time = $time * $scale;
63 my $C = $2;
64 my $cpu = $3;
65 my $y = 400 * $cpu;
66 my $duration = $4 * $scale;
67 my $msec = int($4 * 100000)/100.0;
68 my $height = $C * 20;
69 $style = $styles[$C];
70
71 $y = $y + 140 - $height;
72
73 $x2 = $time + 4;
74 $y2 = $y + 4;
75
76
77 print "<rect x=\"$time\" width=\"$duration\" y=\"$y\" height=\"$height\" style=\"$style\"/>\n";
78 print "<text transform=\"translate($x2,$y2) rotate(90)\">C$C $msec</text>\n";
79 }
80 if ($line =~ /([0-9\.]+)\] PSTATE: Going to P([0-9]) on cpu ([0-9]+)/) {
81 my $time = $1 - $base;
82 my $state = $2;
83 my $cpu = $3;
84
85 if (defined($pstate_last[$cpu])) {
86 my $from = $pstate_last[$cpu];
87 my $oldstate = $pstate_state[$cpu];
88 my $duration = ($time-$from) * $scale;
89
90 $from = $from * $scale;
91 my $to = $from + $duration;
92 my $height = 140 - ($oldstate * (140/8));
93
94 my $y = 400 * $cpu + 200 + $height;
95 my $y2 = $y+4;
96 my $style = $styles[8];
97
98 print "<rect x=\"$from\" y=\"$y\" width=\"$duration\" height=\"5\" style=\"$style\"/>\n";
99 print "<text transform=\"translate($from,$y2)\">P$oldstate (cpu $cpu)</text>\n";
100 };
101
102 $pstate_last[$cpu] = $time;
103 $pstate_state[$cpu] = $state;
104 }
105}
106
107
108print "</svg>\n";