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perf timechart: Add a power-only mode

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For doing work on the Linux power management components, I need to
make long (30+ seconds) traces. Currently, this then results in a
HUGE svg file, with mostly process data that isn't interesting.

This patch adds a --power-only mode to perf timechart that only
outputs the CPU power section of the SVG; this significantly
reduces the size of the SVG file, making even 30+ second traces
viewable with inkscape.

As a minor tweak for the same effect, the minimum text size is
decreased; current inkscape cannot zoom in deep enough to show text
this small, but it reduces inkscape compute time.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: peterz@infradead.org
LKML-Reference: <20090924154013.0675ab71@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arjan van de Ven 2009-09-24 15:40:13 +02:00 • committed by Ingo Molnar
parent 8357275bb9
commit 39a90a8ef1
3 changed files with 23 additions and 4 deletions
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14
tools/perf/util/svghelper.c
View file

@ -28,7 +28,7 @@ static u64 turbo_frequency, max_freq;
int svg_page_width = 1000;
#define MIN_TEXT_SIZE 0.001
#define MIN_TEXT_SIZE 0.01
static u64 total_height;
static FILE *svgfile;
@ -217,6 +217,18 @@ static char *cpu_model(void)
}
fclose(file);
}
/* CPU type */
file = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies", "r");
if (file) {
while (fgets(buf, 255, file)) {
unsigned int freq;
freq = strtoull(buf, NULL, 10);
if (freq > max_freq)
max_freq = freq;
}
fclose(file);
}
return cpu_m;
}