Commit 9396c9cb authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
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perf sched timehist: Show total scheduling time 



Show length of analyzed sample time and rate of idle task running.
This also takes care of time range given by --time option.

  $ perf sched timehist -sI | tail
  Samples do not have callchains.
  Idle stats:
      CPU  0 idle for    930.316  msec  ( 92.93%)
      CPU  1 idle for    963.614  msec  ( 96.25%)
      CPU  2 idle for    885.482  msec  ( 88.45%)
      CPU  3 idle for    938.635  msec  ( 93.76%)

      Total number of unique tasks: 118
  Total number of context switches: 2337
             Total run time (msec): 3718.048
      Total scheduling time (msec): 1001.131  (x 4)

Suggested-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20161222060350.17655-3-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 3705b975

tools/perf/builtin-sched.c

+14 −3
Original line number Diff line number Diff line
@@ -209,6 +209,7 @@ struct perf_sched { 
	u64		skipped_samples;

	const char	*time_str;

	struct perf_time_interval ptime;

	struct perf_time_interval hist_time;

};



/* per thread run time data */
@@ -2460,6 +2461,11 @@ static int timehist_sched_change_event(struct perf_tool *tool, 
		timehist_print_sample(sched, sample, &al, thread, t);



out:

	if (sched->hist_time.start == 0 && t >= ptime->start)

		sched->hist_time.start = t;

	if (ptime->end == 0 || t <= ptime->end)

		sched->hist_time.end = t;



	if (tr) {

		/* time of this sched_switch event becomes last time task seen */

		tr->last_time = sample->time;
@@ -2624,6 +2630,7 @@ static void timehist_print_summary(struct perf_sched *sched, 
	struct thread *t;

	struct thread_runtime *r;

	int i;

	u64 hist_time = sched->hist_time.end - sched->hist_time.start;



	memset(&totals, 0, sizeof(totals));
@@ -2665,7 +2672,7 @@ static void timehist_print_summary(struct perf_sched *sched, 
			totals.sched_count += r->run_stats.n;

			printf("    CPU %2d idle for ", i);

			print_sched_time(r->total_run_time, 6);

			printf(" msec\n");

			printf(" msec  (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);

		} else

			printf("    CPU %2d idle entire time window\n", i);

	}
@@ -2701,12 +2708,16 @@ static void timehist_print_summary(struct perf_sched *sched, 


	printf("\n"

	       "    Total number of unique tasks: %" PRIu64 "\n"

	       "Total number of context switches: %" PRIu64 "\n"

	       "           Total run time (msec): ",

	       "Total number of context switches: %" PRIu64 "\n",

	       totals.task_count, totals.sched_count);



	printf("           Total run time (msec): ");

	print_sched_time(totals.total_run_time, 2);

	printf("\n");



	printf("    Total scheduling time (msec): ");

	print_sched_time(hist_time, 2);

	printf(" (x %d)\n", sched->max_cpu);

}



typedef int (*sched_handler)(struct perf_tool *tool,

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