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Commit 3bc2fa9c authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
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perf sched timehist: Introduce struct idle_time_data 



The struct idle_time_data is to keep idle stats with callchains entering
to the idle task.  The normal thread_runtime calculation is done
transparently since it extends the struct thread_runtime.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161208144755.16673-3-namhyung@kernel.org


[ Align struct field names ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 96039c7c

tools/perf/builtin-sched.c

+33 −4
Original line number Diff line number Diff line
@@ -230,6 +230,15 @@ struct evsel_runtime { 
	u32 ncpu;       /* highest cpu slot allocated */

};



/* per cpu idle time data */

struct idle_thread_runtime {

	struct thread_runtime	tr;

	struct thread		*last_thread;

	struct rb_root		sorted_root;

	struct callchain_root	callchain;

	struct callchain_cursor	cursor;

};



/* track idle times per cpu */

static struct thread **idle_threads;

static int idle_max_cpu;
@@ -1997,13 +2006,31 @@ static void save_task_callchain(struct perf_sched *sched, 
	}

}



static int init_idle_thread(struct thread *thread)

{

	struct idle_thread_runtime *itr;



	thread__set_comm(thread, idle_comm, 0);



	itr = zalloc(sizeof(*itr));

	if (itr == NULL)

		return -ENOMEM;



	init_stats(&itr->tr.run_stats);

	callchain_init(&itr->callchain);

	callchain_cursor_reset(&itr->cursor);

	thread__set_priv(thread, itr);



	return 0;

}



/*

 * Track idle stats per cpu by maintaining a local thread

 * struct for the idle task on each cpu.

 */

static int init_idle_threads(int ncpu)

{

	int i;

	int i, ret;



	idle_threads = zalloc(ncpu * sizeof(struct thread *));

	if (!idle_threads)
@@ -2017,7 +2044,9 @@ static int init_idle_threads(int ncpu) 
		if (idle_threads[i] == NULL)

			return -ENOMEM;



		thread__set_comm(idle_threads[i], idle_comm, 0);

		ret = init_idle_thread(idle_threads[i]);

		if (ret < 0)

			return ret;

	}



	return 0;
@@ -2064,8 +2093,8 @@ static struct thread *get_idle_thread(int cpu) 
		idle_threads[cpu] = thread__new(0, 0);



		if (idle_threads[cpu]) {

			idle_threads[cpu]->tid = 0;

			thread__set_comm(idle_threads[cpu], idle_comm, 0);

			if (init_idle_thread(idle_threads[cpu]) < 0)

				return NULL;

		}

	}