Commit | Line | Data |
---|---|---|
fa72e9e4 IM |
1 | /* |
2 | * idle-task scheduling class. | |
3 | * | |
4 | * (NOTE: these are not related to SCHED_IDLE tasks which are | |
5 | * handled in sched_fair.c) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Idle tasks are unconditionally rescheduled: | |
10 | */ | |
11 | static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p) | |
12 | { | |
13 | resched_task(rq->idle); | |
14 | } | |
15 | ||
16 | static struct task_struct *pick_next_task_idle(struct rq *rq, u64 now) | |
17 | { | |
18 | schedstat_inc(rq, sched_goidle); | |
19 | ||
20 | return rq->idle; | |
21 | } | |
22 | ||
23 | /* | |
24 | * It is not legal to sleep in the idle task - print a warning | |
25 | * message if some code attempts to do it: | |
26 | */ | |
27 | static void | |
28 | dequeue_task_idle(struct rq *rq, struct task_struct *p, int sleep, u64 now) | |
29 | { | |
30 | spin_unlock_irq(&rq->lock); | |
31 | printk(KERN_ERR "bad: scheduling from the idle thread!\n"); | |
32 | dump_stack(); | |
33 | spin_lock_irq(&rq->lock); | |
34 | } | |
35 | ||
36 | static void put_prev_task_idle(struct rq *rq, struct task_struct *prev, u64 now) | |
37 | { | |
38 | } | |
39 | ||
40 | static int | |
41 | load_balance_idle(struct rq *this_rq, int this_cpu, struct rq *busiest, | |
42 | unsigned long max_nr_move, unsigned long max_load_move, | |
43 | struct sched_domain *sd, enum cpu_idle_type idle, | |
44 | int *all_pinned, unsigned long *total_load_moved) | |
45 | { | |
46 | return 0; | |
47 | } | |
48 | ||
49 | static void task_tick_idle(struct rq *rq, struct task_struct *curr) | |
50 | { | |
51 | } | |
52 | ||
53 | /* | |
54 | * Simple, special scheduling class for the per-CPU idle tasks: | |
55 | */ | |
56 | static struct sched_class idle_sched_class __read_mostly = { | |
57 | /* no enqueue/yield_task for idle tasks */ | |
58 | ||
59 | /* dequeue is not valid, we print a debug message there: */ | |
60 | .dequeue_task = dequeue_task_idle, | |
61 | ||
62 | .check_preempt_curr = check_preempt_curr_idle, | |
63 | ||
64 | .pick_next_task = pick_next_task_idle, | |
65 | .put_prev_task = put_prev_task_idle, | |
66 | ||
67 | .load_balance = load_balance_idle, | |
68 | ||
69 | .task_tick = task_tick_idle, | |
70 | /* no .task_new for idle tasks */ | |
71 | }; |