1 files changed, 12 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 94b9d11e3312..c1b8b3031eb2 100644
--- a/kernel/sched.c
+++ b/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 @@ out_balanced:
 
         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