From b4d88b36392eeb1ef6fb046df12d3c8de8164abf Mon Sep 17 00:00:00 2001
From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Date: Thu, 18 Dec 2008 23:26:22 +0530
Subject: [PATCH] --- yaml --- r: 125379 b: refs/heads/master c:
 7a09b1a27b1e5a4957e4af9951420fea02c44fba h: refs/heads/master i:   125377:
 5167f85d20c5f19fb1918cf648f3b12c4a73bbb7   125375:
 ba54daf08996891bea0604cf8dc17193ade1a083 v: v3

---
 [refs]               |  2 +-
 trunk/kernel/sched.c | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index e6704df86fea..0c3004d1c69d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d5679bd11916eba5c8ee9033003e1a5ce56ece9a
+refs/heads/master: 7a09b1a27b1e5a4957e4af9951420fea02c44fba
diff --git a/trunk/kernel/sched.c b/trunk/kernel/sched.c
index 94b9d11e3312..c1b8b3031eb2 100644
--- a/trunk/kernel/sched.c
+++ b/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