---

yaml
---
r: 135675
b: refs/heads/master
c: 7e96fa5
h: refs/heads/master
i:
  135673: dbdca65
  135671: ac47e73
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 777c2f389e463428fd7e2871051a84d7fe84b172
+refs/heads/master: 7e96fa5875d4a9be18d74d3ca7b90518d05bc426

trunk/kernel/sched.c

@@ -2984,6 +2984,16 @@ balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
 	pulled++;
 	rem_load_move -= p->se.load.weight;
 
+#ifdef CONFIG_PREEMPT
+	/*
+	 * NEWIDLE balancing is a source of latency, so preemptible kernels
+	 * will stop after the first task is pulled to minimize the critical
+	 * section.
+	 */
+	if (idle == CPU_NEWLY_IDLE)
+		goto out;
+#endif
+
 	/*
 	 * We only want to steal up to the prescribed amount of weighted load.
 	 */
@@ -3030,9 +3040,15 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
 				sd, idle, all_pinned, &this_best_prio);
 		class = class->next;
 
+#ifdef CONFIG_PREEMPT
+		/*
+		 * NEWIDLE balancing is a source of latency, so preemptible
+		 * kernels will stop after the first task is pulled to minimize
+		 * the critical section.
+		 */
 		if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
 			break;
-
+#endif
 	} while (class && max_load_move > total_load_moved);
 
 	return total_load_moved > 0;