BFS: back out BFS scheduler for stability reasons

It works faster sometimes, other times not.. the code is so old now

kernel/workqueue.c

@@ -317,6 +317,8 @@ static int worker_thread(void *__cwq)
 	if (cwq->wq->freezeable)
 		set_freezable();
 
+	set_user_nice(current, -5);
+
 	for (;;) {
 		prepare_to_wait(&cwq->more_work, &wait, TASK_INTERRUPTIBLE);
 		if (!freezing(current) &&