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Subject[patch] perf timechart: Add a power-only mode
From: Arjan van de Ven <arjan@linux.intel.com>
Subject: perf timechart: Add a power-only mode

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>

diff --git a/tools/perf/Documentation/perf-timechart.txt b/tools/perf/Documentation/perf-timechart.txt
index 1c2ed30..a791009 100644
--- a/tools/perf/Documentation/perf-timechart.txt
+++ b/tools/perf/Documentation/perf-timechart.txt
@@ -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
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 4405681..702d8fe 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -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()
};

diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index a778fd0..856655d 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -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;
}


--
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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