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Commit ea92ed5a authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf sched: Add runtime stats 



Extend the latency tracking structure with scheduling atom
runtime info - and sum it up during per task display.

(Also clean up a few details.)

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: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d9340c1d

tools/perf/builtin-sched.c

+38 −20
Original line number Diff line number Diff line
@@ -877,6 +877,7 @@ struct lat_snapshot { 
	enum thread_state	state;

	u64			wake_up_time;

	u64			sched_in_time;

	u64			runtime;

};



struct thread_latency {
@@ -951,6 +952,7 @@ latency_fork_event(struct trace_fork_event *fork_event __used, 
	/* should insert the newcomer */

}



__used

static char sched_out_state(struct trace_switch_event *switch_event)

{

	const char *str = TASK_STATE_TO_CHAR_STR;
@@ -960,17 +962,15 @@ static char sched_out_state(struct trace_switch_event *switch_event) 


static void

lat_sched_out(struct thread_latency *lat,

	     struct trace_switch_event *switch_event)

	     struct trace_switch_event *switch_event __used, u64 delta)

{

	struct lat_snapshot *snapshot;



	if (sched_out_state(switch_event) == 'R')

		return;



	snapshot = calloc(sizeof(*snapshot), 1);

	if (!snapshot)

		die("Non memory");



	snapshot->runtime = delta;

	list_add_tail(&snapshot->list, &lat->snapshot_list);

}
@@ -997,16 +997,31 @@ lat_sched_in(struct thread_latency *lat, u64 timestamp) 
	snapshot->sched_in_time = timestamp;

}





static void

latency_switch_event(struct trace_switch_event *switch_event,

		     struct event *event __used,

		     int cpu __used,

		     int cpu,

		     u64 timestamp,

		     struct thread *thread __used)

{

	struct thread_latency *out_lat, *in_lat;

	struct thread *sched_out, *sched_in;

	u64 timestamp0;

	s64 delta;



	if (cpu >= MAX_CPUS || cpu < 0)

		return;



	timestamp0 = cpu_last_switched[cpu];

	cpu_last_switched[cpu] = timestamp;

	if (timestamp0)

		delta = timestamp - timestamp0;

	else

		delta = 0;



	if (delta < 0)

		die("hm, delta: %Ld < 0 ?\n", delta);





	sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);

	sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
@@ -1028,7 +1043,7 @@ latency_switch_event(struct trace_switch_event *switch_event, 
	}



	lat_sched_in(in_lat, timestamp);

	lat_sched_out(out_lat, switch_event);

	lat_sched_out(out_lat, switch_event, delta);

}



static void
@@ -1080,8 +1095,11 @@ static void output_lat_thread(struct thread_latency *lat) 
	int ret;

	u64 max = 0, avg;

	u64 total = 0, delta;

	u64 total_runtime = 0;



	list_for_each_entry(shot, &lat->snapshot_list, list) {

		total_runtime += shot->runtime;



		if (shot->state != THREAD_SCHED_IN)

			continue;
@@ -1104,7 +1122,7 @@ static void output_lat_thread(struct thread_latency *lat) 
	avg = total / count;



	printf("|%9.3f ms |%9d | avg:%9.3f ms | max:%9.3f ms |\n",

		0.0, count, (double)avg/1e9, (double)max/1e9);

		(double)total_runtime/1e9, count, (double)avg/1e9, (double)max/1e9);

}



static void __cmd_lat(void)