sched/fair: Only kick nohz balance when runqueue has more than 1 task

Misfit task will go through active migration path so there is no need
to check in the nohz balance case.

Change-Id: Ic05035d8c745797c4a5cbe52b7cdbd98edb352f3
Signed-off-by: Runmin Wang <runminw@codeaurora.org>

kernel/sched/fair.c

@@ -11209,13 +11209,16 @@ static inline bool nohz_kick_needed(struct rq *rq, bool only_update)
 	if (time_before(now, nohz.next_balance))
 		return false;
 
+	/*
+	 * If energy aware is enabled, do idle load balance if runqueue has
+	 * at least 2 tasks and cpu is overutilized
+	 */
 	if (rq->nr_running >= 2 &&
 	    (!energy_aware() || cpu_overutilized(cpu)))
 		return true;
 
-	/* Do idle load balance if there have misfit task */
 	if (energy_aware())
-		return rq_has_misfit(rq);
+		return false;
 
 	rcu_read_lock();
 	sds = rcu_dereference(per_cpu(sd_llc_shared, cpu));