2 * idle-task scheduling class.
4 * (NOTE: these are not related to SCHED_IDLE tasks which are
5 * handled in sched_fair.c)
9 static int select_task_rq_idle(struct task_struct *p, int sync)
11 return task_cpu(p); /* IDLE tasks as never migrated */
13 #endif /* CONFIG_SMP */
15 * Idle tasks are unconditionally rescheduled:
17 static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p)
19 resched_task(rq->idle);
22 static struct task_struct *pick_next_task_idle(struct rq *rq)
24 schedstat_inc(rq, sched_goidle);
30 * It is not legal to sleep in the idle task - print a warning
31 * message if some code attempts to do it:
34 dequeue_task_idle(struct rq *rq, struct task_struct *p, int sleep)
36 spin_unlock_irq(&rq->lock);
37 printk(KERN_ERR "bad: scheduling from the idle thread!\n");
39 spin_lock_irq(&rq->lock);
42 static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
48 load_balance_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
49 unsigned long max_load_move,
50 struct sched_domain *sd, enum cpu_idle_type idle,
51 int *all_pinned, int *this_best_prio)
57 move_one_task_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
58 struct sched_domain *sd, enum cpu_idle_type idle)
64 static void task_tick_idle(struct rq *rq, struct task_struct *curr)
68 static void set_curr_task_idle(struct rq *rq)
73 * Simple, special scheduling class for the per-CPU idle tasks:
75 const struct sched_class idle_sched_class = {
77 /* no enqueue/yield_task for idle tasks */
79 /* dequeue is not valid, we print a debug message there: */
80 .dequeue_task = dequeue_task_idle,
82 .select_task_rq = select_task_rq_idle,
83 #endif /* CONFIG_SMP */
85 .check_preempt_curr = check_preempt_curr_idle,
87 .pick_next_task = pick_next_task_idle,
88 .put_prev_task = put_prev_task_idle,
91 .load_balance = load_balance_idle,
92 .move_one_task = move_one_task_idle,
95 .set_curr_task = set_curr_task_idle,
96 .task_tick = task_tick_idle,
97 /* no .task_new for idle tasks */