sched: resched task in task_new_fair()

to get full child-runs-first semantics make sure the parent is
rescheduled.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

kernel/sched_fair.c

@@ -1191,6 +1191,7 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
 		se->wait_runtime = -(sched_granularity(cfs_rq) / 2);
 
 	__enqueue_entity(cfs_rq, se);
+	resched_task(rq->curr);
 }
 
 #ifdef CONFIG_FAIR_GROUP_SCHED