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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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3
tools/perf/Documentation/perf-timechart.txt
View file

@ -31,6 +31,9 @@ OPTIONS
-w::
--width=::
Select the width of the SVG file (default: 1000)
-p::
--power-only::
Only output the CPU power section of the diagram
SEE ALSO

10
tools/perf/builtin-timechart.c
View file

@ -46,6 +46,8 @@ static u64 turbo_frequency;
static u64 first_time, last_time;
static int power_only;
static struct perf_header *header;
@ -547,7 +549,7 @@ static void end_sample_processing(void)
u64 cpu;
struct power_event *pwr;
for (cpu = 0; cpu < numcpus; cpu++) {
for (cpu = 0; cpu <= numcpus; cpu++) {
pwr = malloc(sizeof(struct power_event));
if (!pwr)
return;
@ -871,7 +873,7 @@ static int determine_display_tasks(u64 threshold)
/* no exit marker, task kept running to the end */
if (p->end_time == 0)
p->end_time = last_time;
if (p->total_time >= threshold)
if (p->total_time >= threshold && !power_only)
p->display = 1;
c = p->all;
@ -882,7 +884,7 @@ static int determine_display_tasks(u64 threshold)
if (c->start_time == 1)
c->start_time = first_time;
if (c->total_time >= threshold) {
if (c->total_time >= threshold && !power_only) {
c->display = 1;
count++;
}
@ -1134,6 +1136,8 @@ static const struct option options[] = {
"output file name"),
OPT_INTEGER('w', "width", &svg_page_width,
"page width"),
OPT_BOOLEAN('p', "power-only", &power_only,
"output power data only"),
OPT_END()
};

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;
}