sched/debug: Rename and move enqueue_sleeper()

enqueue_sleeper() doesn't actually enqueue, it just handles some
statistics and tracepoints.  Rename it to update_stats_enqueue_sleeper()
and call it from update_stats_enqueue().

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/fb20b7159dc4d028c406c0e8d5f8c439b741615b.1466184592.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/fair.c

@@ -862,11 +862,72 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	se->statistics.wait_start = 0;
 }
 
+static void
+update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+	struct task_struct *tsk = NULL;
+
+	if (entity_is_task(se))
+		tsk = task_of(se);
+
+	if (se->statistics.sleep_start) {
+		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.sleep_start;
+
+		if ((s64)delta < 0)
+			delta = 0;
+
+		if (unlikely(delta > se->statistics.sleep_max))
+			se->statistics.sleep_max = delta;
+
+		se->statistics.sleep_start = 0;
+		se->statistics.sum_sleep_runtime += delta;
+
+		if (tsk) {
+			account_scheduler_latency(tsk, delta >> 10, 1);
+			trace_sched_stat_sleep(tsk, delta);
+		}
+	}
+	if (se->statistics.block_start) {
+		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.block_start;
+
+		if ((s64)delta < 0)
+			delta = 0;
+
+		if (unlikely(delta > se->statistics.block_max))
+			se->statistics.block_max = delta;
+
+		se->statistics.block_start = 0;
+		se->statistics.sum_sleep_runtime += delta;
+
+		if (tsk) {
+			if (tsk->in_iowait) {
+				se->statistics.iowait_sum += delta;
+				se->statistics.iowait_count++;
+				trace_sched_stat_iowait(tsk, delta);
+			}
+
+			trace_sched_stat_blocked(tsk, delta);
+
+			/*
+			 * Blocking time is in units of nanosecs, so shift by
+			 * 20 to get a milliseconds-range estimation of the
+			 * amount of time that the task spent sleeping:
+			 */
+			if (unlikely(prof_on == SLEEP_PROFILING)) {
+				profile_hits(SLEEP_PROFILING,
+						(void *)get_wchan(tsk),
+						delta >> 20);
+			}
+			account_scheduler_latency(tsk, delta >> 10, 0);
+		}
+	}
+}
+
 /*
  * Task is being enqueued - update stats:
  */
 static inline void
-update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
+update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
 	/*
 	 * Are we enqueueing a waiting task? (for current tasks
@@ -874,6 +935,9 @@ update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	 */
 	if (se != cfs_rq->curr)
 		update_stats_wait_start(cfs_rq, se);
+
+	if (flags & ENQUEUE_WAKEUP)
+		update_stats_enqueue_sleeper(cfs_rq, se);
 }
 
 static inline void
@@ -910,7 +974,12 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
 }
 
 static inline void
-update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
+update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+}
+
+static inline void
+update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
 }
 
@@ -3197,68 +3266,6 @@ static inline int idle_balance(struct rq *rq)
 
 #endif /* CONFIG_SMP */
 
-static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
-{
-#ifdef CONFIG_SCHEDSTATS
-	struct task_struct *tsk = NULL;
-
-	if (entity_is_task(se))
-		tsk = task_of(se);
-
-	if (se->statistics.sleep_start) {
-		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.sleep_start;
-
-		if ((s64)delta < 0)
-			delta = 0;
-
-		if (unlikely(delta > se->statistics.sleep_max))
-			se->statistics.sleep_max = delta;
-
-		se->statistics.sleep_start = 0;
-		se->statistics.sum_sleep_runtime += delta;
-
-		if (tsk) {
-			account_scheduler_latency(tsk, delta >> 10, 1);
-			trace_sched_stat_sleep(tsk, delta);
-		}
-	}
-	if (se->statistics.block_start) {
-		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.block_start;
-
-		if ((s64)delta < 0)
-			delta = 0;
-
-		if (unlikely(delta > se->statistics.block_max))
-			se->statistics.block_max = delta;
-
-		se->statistics.block_start = 0;
-		se->statistics.sum_sleep_runtime += delta;
-
-		if (tsk) {
-			if (tsk->in_iowait) {
-				se->statistics.iowait_sum += delta;
-				se->statistics.iowait_count++;
-				trace_sched_stat_iowait(tsk, delta);
-			}
-
-			trace_sched_stat_blocked(tsk, delta);
-
-			/*
-			 * Blocking time is in units of nanosecs, so shift by
-			 * 20 to get a milliseconds-range estimation of the
-			 * amount of time that the task spent sleeping:
-			 */
-			if (unlikely(prof_on == SLEEP_PROFILING)) {
-				profile_hits(SLEEP_PROFILING,
-						(void *)get_wchan(tsk),
-						delta >> 20);
-			}
-			account_scheduler_latency(tsk, delta >> 10, 0);
-		}
-	}
-#endif
-}
-
 static void check_spread(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 #ifdef CONFIG_SCHED_DEBUG
@@ -3385,15 +3392,12 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	account_entity_enqueue(cfs_rq, se);
 	update_cfs_shares(cfs_rq);
 
-	if (flags & ENQUEUE_WAKEUP) {
+	if (flags & ENQUEUE_WAKEUP)
 		place_entity(cfs_rq, se, 0);
-		if (schedstat_enabled())
-			enqueue_sleeper(cfs_rq, se);
-	}
 
 	check_schedstat_required();
 	if (schedstat_enabled()) {
-		update_stats_enqueue(cfs_rq, se);
+		update_stats_enqueue(cfs_rq, se, flags);
 		check_spread(cfs_rq, se);
 	}
 	if (!curr)