f3f47a6768
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>
108 lines
3.3 KiB
Perl
108 lines
3.3 KiB
Perl
#!/usr/bin/perl
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# Copyright 2008, Intel Corporation
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#
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# This file is part of the Linux kernel
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#
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# This program file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; version 2 of the License.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program in a file named COPYING; if not, write to the
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# Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301 USA
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#
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# Authors:
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# Arjan van de Ven <arjan@linux.intel.com>
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#
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# This script turns a cstate ftrace output into a SVG graphic that shows
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# historic C-state information
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#
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#
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# cat /sys/kernel/debug/tracing/trace | perl power.pl > out.svg
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#
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my @styles;
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my $base = 0;
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my @pstate_last;
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my @pstate_level;
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$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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$styles[8] = "fill:rgb(0,25,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
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print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
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print "<svg width=\"10000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
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my $scale = 30000.0;
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while (<>) {
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my $line = $_;
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if ($line =~ /([0-9\.]+)\] CSTATE: Going to C([0-9]) on cpu ([0-9]+) for ([0-9\.]+)/) {
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if ($base == 0) {
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$base = $1;
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}
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my $time = $1 - $base;
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$time = $time * $scale;
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my $C = $2;
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my $cpu = $3;
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my $y = 400 * $cpu;
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my $duration = $4 * $scale;
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my $msec = int($4 * 100000)/100.0;
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my $height = $C * 20;
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$style = $styles[$C];
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$y = $y + 140 - $height;
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$x2 = $time + 4;
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$y2 = $y + 4;
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print "<rect x=\"$time\" width=\"$duration\" y=\"$y\" height=\"$height\" style=\"$style\"/>\n";
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print "<text transform=\"translate($x2,$y2) rotate(90)\">C$C $msec</text>\n";
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}
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if ($line =~ /([0-9\.]+)\] PSTATE: Going to P([0-9]) on cpu ([0-9]+)/) {
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my $time = $1 - $base;
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my $state = $2;
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my $cpu = $3;
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if (defined($pstate_last[$cpu])) {
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my $from = $pstate_last[$cpu];
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my $oldstate = $pstate_state[$cpu];
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my $duration = ($time-$from) * $scale;
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$from = $from * $scale;
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my $to = $from + $duration;
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my $height = 140 - ($oldstate * (140/8));
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my $y = 400 * $cpu + 200 + $height;
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my $y2 = $y+4;
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my $style = $styles[8];
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print "<rect x=\"$from\" y=\"$y\" width=\"$duration\" height=\"5\" style=\"$style\"/>\n";
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print "<text transform=\"translate($from,$y2)\">P$oldstate (cpu $cpu)</text>\n";
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};
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$pstate_last[$cpu] = $time;
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$pstate_state[$cpu] = $state;
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}
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}
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print "</svg>\n";
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