Commit bbe2987b authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Ingo Molnar
Browse files

perf timechart: Add a process filter 



During the Kernel Summit demo of perf/ftrace/timechart, there
was a feature request to have a process filter for timechart so
that you can zoom into one or a few processes that you are
really interested in.

This patch adds basic support for this feature, the -p
(--process) option now can select a PID or a process name to be
shown. Multiple -p options are allowed, and the combined set
will be included in the output.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091020070939.7d0fb8a7@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c258449b

tools/perf/Documentation/perf-timechart.txt

+4 −1
Original line number Diff line number Diff line
@@ -31,9 +31,12 @@ OPTIONS 
-w::

--width=::

        Select the width of the SVG file (default: 1000)

-p::

-P::

--power-only::

        Only output the CPU power section of the diagram

-p::

--process::

        Select the processes to display, by name or PID





SEE ALSO

tools/perf/builtin-timechart.c

+102 −3
Original line number Diff line number Diff line
@@ -153,6 +153,17 @@ static struct wake_event *wake_events; 


struct sample_wrapper *all_samples;





struct process_filter;

struct process_filter {

	char 			*name;

	int  			pid;

	struct process_filter 	*next;

};



static struct process_filter *process_filter;





static struct per_pid *find_create_pid(int pid)

{

	struct per_pid *cursor = all_data;
@@ -763,11 +774,11 @@ static void draw_wakeups(void) 
				c = p->all;

				while (c) {

					if (c->Y && c->start_time <= we->time && c->end_time >= we->time) {

						if (p->pid == we->waker) {

						if (p->pid == we->waker && !from) {

							from = c->Y;

							task_from = strdup(c->comm);

						}

						if (p->pid == we->wakee) {

						if (p->pid == we->wakee && !to) {

							to = c->Y;

							task_to = strdup(c->comm);

						}
@@ -882,12 +893,89 @@ static void draw_process_bars(void) 
	}

}



static void add_process_filter(const char *string)

{

	struct process_filter *filt;

	int pid;



	pid = strtoull(string, NULL, 10);

	filt = malloc(sizeof(struct process_filter));

	if (!filt)

		return;



	filt->name = strdup(string);

	filt->pid  = pid;

	filt->next = process_filter;



	process_filter = filt;

}



static int passes_filter(struct per_pid *p, struct per_pidcomm *c)

{

	struct process_filter *filt;

	if (!process_filter)

		return 1;



	filt = process_filter;

	while (filt) {

		if (filt->pid && p->pid == filt->pid)

			return 1;

		if (strcmp(filt->name, c->comm) == 0)

			return 1;

		filt = filt->next;

	}

	return 0;

}



static int determine_display_tasks_filtered(void)

{

	struct per_pid *p;

	struct per_pidcomm *c;

	int count = 0;



	p = all_data;

	while (p) {

		p->display = 0;

		if (p->start_time == 1)

			p->start_time = first_time;



		/* no exit marker, task kept running to the end */

		if (p->end_time == 0)

			p->end_time = last_time;



		c = p->all;



		while (c) {

			c->display = 0;



			if (c->start_time == 1)

				c->start_time = first_time;



			if (passes_filter(p, c)) {

				c->display = 1;

				p->display = 1;

				count++;

			}



			if (c->end_time == 0)

				c->end_time = last_time;



			c = c->next;

		}

		p = p->next;

	}

	return count;

}



static int determine_display_tasks(u64 threshold)

{

	struct per_pid *p;

	struct per_pidcomm *c;

	int count = 0;



	if (process_filter)

		return determine_display_tasks_filtered();



	p = all_data;

	while (p) {

		p->display = 0;
@@ -1153,6 +1241,14 @@ static int __cmd_record(int argc, const char **argv) 
	return cmd_record(i, rec_argv, NULL);

}



static int

parse_process(const struct option *opt __used, const char *arg, int __used unset)

{

	if (arg)

		add_process_filter(arg);

	return 0;

}



static const struct option options[] = {

	OPT_STRING('i', "input", &input_name, "file",

		    "input file name"),
@@ -1160,8 +1256,11 @@ static const struct option options[] = { 
		    "output file name"),

	OPT_INTEGER('w', "width", &svg_page_width,

		    "page width"),

	OPT_BOOLEAN('p', "power-only", &power_only,

	OPT_BOOLEAN('P', "power-only", &power_only,

		    "output power data only"),

	OPT_CALLBACK('p', "process", NULL, "process",

		      "process selector. Pass a pid or process name.",

		       parse_process),

	OPT_END()

};

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