1 files changed, 10 insertions, 1 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index e4a5888549a5..e60786eb731c 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1406,7 +1406,16 @@ static int wake_idle(int cpu, struct task_struct *p)
         struct sched_domain *sd;
         int i;
 
-        if (idle_cpu(cpu))
+        /*
+         * If it is idle, then it is the best cpu to run this task.
+         *
+         * This cpu is also the best, if it has more than one task already.
+         * Siblings must be also busy(in most cases) as they didn't already
+         * pickup the extra load from this cpu and hence we need not check
+         * sibling runqueue info. This will avoid the checks and cache miss
+         * penalities associated with that.
+         */
+        if (idle_cpu(cpu) || cpu_rq(cpu)->nr_running > 1)
                 return cpu;
 
         for_each_domain(cpu, sd) {