---

yaml --- r: 135700 b: refs/heads/master c: 8a0be9e h: refs/heads/master v: v3
git-mirror · Mar 5, 2009 · dd0ba9f · dd0ba9f
1 parent e4a74ab
commit dd0ba9f
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Showing 2 changed files with 9 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 49d2d266adff27793fed247a2e9e672d59b6ddc6
+refs/heads/master: 8a0be9ef8225638d26b455788f988c8f84ce9e75
diff --git a/trunk/kernel/sched.c b/trunk/kernel/sched.c
@@ -4148,6 +4148,11 @@ static void run_rebalance_domains(struct softirq_action *h)
 #endif
 }
 
+static inline int on_null_domain(int cpu)
+{
+	return !rcu_dereference(cpu_rq(cpu)->sd);
+}
+
 /*
  * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
  *
@@ -4205,7 +4210,9 @@ static inline void trigger_load_balance(struct rq *rq, int cpu)
 	    cpumask_test_cpu(cpu, nohz.cpu_mask))
 		return;
 #endif
-	if (time_after_eq(jiffies, rq->next_balance))
+	/* Don't need to rebalance while attached to NULL domain */
+	if (time_after_eq(jiffies, rq->next_balance) &&
+	    likely(!on_null_domain(cpu)))
 		raise_softirq(SCHED_SOFTIRQ);
 }