---

yaml
---
r: 3301
b: refs/heads/master
c: 77391d7
h: refs/heads/master
i:
  3299: b1e50c9
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 476d139c218e44e045e4bc6d4cc02b010b343939
+refs/heads/master: 77391d71681d05d2f4502f91ad62618522abf624

trunk/kernel/sched.c

@@ -2030,6 +2030,12 @@ static runqueue_t *find_busiest_queue(struct sched_group *group)
 	return busiest;
 }
 
+/*
+ * Max backoff if we encounter pinned tasks. Pretty arbitrary value, but
+ * so long as it is large enough.
+ */
+#define MAX_PINNED_INTERVAL	512
+
 /*
  * Check this_cpu to ensure it is balanced within domain. Attempt to move
  * tasks if there is an imbalance.
@@ -2042,7 +2048,7 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
 	struct sched_group *group;
 	runqueue_t *busiest;
 	unsigned long imbalance;
-	int nr_moved, all_pinned;
+	int nr_moved, all_pinned = 0;
 	int active_balance = 0;
 
 	spin_lock(&this_rq->lock);
@@ -2133,7 +2139,8 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
 
 	sd->nr_balance_failed = 0;
 	/* tune up the balancing interval */
-	if (sd->balance_interval < sd->max_interval)
+	if ((all_pinned && sd->balance_interval < MAX_PINNED_INTERVAL) ||
+			(sd->balance_interval < sd->max_interval))
 		sd->balance_interval *= 2;
 
 	return 0;