---

yaml
---
r: 125379
b: refs/heads/master
c: 7a09b1a
h: refs/heads/master
i:
  125377: 5167f85
  125375: ba54daf
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d5679bd11916eba5c8ee9033003e1a5ce56ece9a
+refs/heads/master: 7a09b1a27b1e5a4957e4af9951420fea02c44fba

trunk/kernel/sched.c

@@ -509,6 +509,14 @@ struct root_domain {
 #ifdef CONFIG_SMP
 	struct cpupri cpupri;
 #endif
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+	/*
+	 * Preferred wake up cpu nominated by sched_mc balance that will be
+	 * used when most cpus are idle in the system indicating overall very
+	 * low system utilisation. Triggered at POWERSAVINGS_BALANCE_WAKEUP(2)
+	 */
+	unsigned int sched_mc_preferred_wakeup_cpu;
+#endif
 };
 
 /*
@@ -3384,6 +3392,10 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
 
 	if (this == group_leader && group_leader != group_min) {
 		*imbalance = min_load_per_task;
+		if (sched_mc_power_savings >= POWERSAVINGS_BALANCE_WAKEUP) {
+			cpu_rq(this_cpu)->rd->sched_mc_preferred_wakeup_cpu =
+					first_cpu(group_leader->cpumask);
+		}
 		return group_min;
 	}
 #endif