2011-10-25 02:00:11 -06:00
|
|
|
#include "sched.h"
|
|
|
|
|
2007-07-09 10:51:58 -06:00
|
|
|
/*
|
|
|
|
* idle-task scheduling class.
|
|
|
|
*
|
|
|
|
* (NOTE: these are not related to SCHED_IDLE tasks which are
|
2012-04-02 02:00:44 -06:00
|
|
|
* handled in sched/fair.c)
|
2007-07-09 10:51:58 -06:00
|
|
|
*/
|
|
|
|
|
2008-01-25 13:08:09 -07:00
|
|
|
#ifdef CONFIG_SMP
|
2010-03-24 11:34:10 -06:00
|
|
|
static int
|
2013-10-07 04:29:16 -06:00
|
|
|
select_task_rq_idle(struct task_struct *p, int cpu, int sd_flag, int flags)
|
2008-01-25 13:08:09 -07:00
|
|
|
{
|
|
|
|
return task_cpu(p); /* IDLE tasks as never migrated */
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
2014-01-23 12:32:21 -07:00
|
|
|
|
2007-07-09 10:51:58 -06:00
|
|
|
/*
|
|
|
|
* Idle tasks are unconditionally rescheduled:
|
|
|
|
*/
|
2009-09-14 11:55:44 -06:00
|
|
|
static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int flags)
|
2007-07-09 10:51:58 -06:00
|
|
|
{
|
2014-06-28 14:03:57 -06:00
|
|
|
resched_curr(rq);
|
2007-07-09 10:51:58 -06:00
|
|
|
}
|
|
|
|
|
2012-02-10 22:05:00 -07:00
|
|
|
static struct task_struct *
|
2016-09-21 07:38:10 -06:00
|
|
|
pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
|
2007-07-09 10:51:58 -06:00
|
|
|
{
|
2014-02-12 02:49:30 -07:00
|
|
|
put_prev_task(rq, prev);
|
2016-05-09 02:38:05 -06:00
|
|
|
update_idle_core(rq);
|
2016-06-17 11:43:24 -06:00
|
|
|
schedstat_inc(rq->sched_goidle);
|
2007-07-09 10:51:58 -06:00
|
|
|
return rq->idle;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* It is not legal to sleep in the idle task - print a warning
|
|
|
|
* message if some code attempts to do it:
|
|
|
|
*/
|
|
|
|
static void
|
2010-03-24 09:38:48 -06:00
|
|
|
dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags)
|
2007-07-09 10:51:58 -06:00
|
|
|
{
|
2009-11-17 06:28:38 -07:00
|
|
|
raw_spin_unlock_irq(&rq->lock);
|
2009-12-20 06:23:57 -07:00
|
|
|
printk(KERN_ERR "bad: scheduling from the idle thread!\n");
|
2007-07-09 10:51:58 -06:00
|
|
|
dump_stack();
|
2009-11-17 06:28:38 -07:00
|
|
|
raw_spin_lock_irq(&rq->lock);
|
2007-07-09 10:51:58 -06:00
|
|
|
}
|
|
|
|
|
2007-08-09 03:16:49 -06:00
|
|
|
static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
|
2007-07-09 10:51:58 -06:00
|
|
|
{
|
2014-01-23 12:32:21 -07:00
|
|
|
rq_last_tick_reset(rq);
|
2007-07-09 10:51:58 -06:00
|
|
|
}
|
|
|
|
|
2008-01-25 13:08:29 -07:00
|
|
|
static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued)
|
2007-07-09 10:51:58 -06:00
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2007-10-15 09:00:08 -06:00
|
|
|
static void set_curr_task_idle(struct rq *rq)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2011-01-17 09:03:27 -07:00
|
|
|
static void switched_to_idle(struct rq *rq, struct task_struct *p)
|
2008-01-25 13:08:22 -07:00
|
|
|
{
|
2011-01-25 08:30:03 -07:00
|
|
|
BUG();
|
2008-01-25 13:08:22 -07:00
|
|
|
}
|
|
|
|
|
2011-01-17 09:03:27 -07:00
|
|
|
static void
|
|
|
|
prio_changed_idle(struct rq *rq, struct task_struct *p, int oldprio)
|
2008-01-25 13:08:22 -07:00
|
|
|
{
|
2011-01-25 08:30:03 -07:00
|
|
|
BUG();
|
2008-01-25 13:08:22 -07:00
|
|
|
}
|
|
|
|
|
2010-01-13 20:21:52 -07:00
|
|
|
static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
|
2009-09-20 19:31:53 -06:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-11-23 15:04:52 -07:00
|
|
|
static void update_curr_idle(struct rq *rq)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2007-07-09 10:51:58 -06:00
|
|
|
/*
|
|
|
|
* Simple, special scheduling class for the per-CPU idle tasks:
|
|
|
|
*/
|
2011-10-25 02:00:11 -06:00
|
|
|
const struct sched_class idle_sched_class = {
|
2007-10-15 09:00:12 -06:00
|
|
|
/* .next is NULL */
|
2007-07-09 10:51:58 -06:00
|
|
|
/* no enqueue/yield_task for idle tasks */
|
|
|
|
|
|
|
|
/* dequeue is not valid, we print a debug message there: */
|
|
|
|
.dequeue_task = dequeue_task_idle,
|
|
|
|
|
|
|
|
.check_preempt_curr = check_preempt_curr_idle,
|
|
|
|
|
|
|
|
.pick_next_task = pick_next_task_idle,
|
|
|
|
.put_prev_task = put_prev_task_idle,
|
|
|
|
|
2007-10-24 10:23:51 -06:00
|
|
|
#ifdef CONFIG_SMP
|
2008-10-22 01:25:26 -06:00
|
|
|
.select_task_rq = select_task_rq_idle,
|
2015-05-15 09:43:35 -06:00
|
|
|
.set_cpus_allowed = set_cpus_allowed_common,
|
2007-10-24 10:23:51 -06:00
|
|
|
#endif
|
2007-07-09 10:51:58 -06:00
|
|
|
|
2007-10-15 09:00:08 -06:00
|
|
|
.set_curr_task = set_curr_task_idle,
|
2007-07-09 10:51:58 -06:00
|
|
|
.task_tick = task_tick_idle,
|
2008-01-25 13:08:22 -07:00
|
|
|
|
2009-09-20 19:31:53 -06:00
|
|
|
.get_rr_interval = get_rr_interval_idle,
|
|
|
|
|
2008-01-25 13:08:22 -07:00
|
|
|
.prio_changed = prio_changed_idle,
|
|
|
|
.switched_to = switched_to_idle,
|
2014-11-23 15:04:52 -07:00
|
|
|
.update_curr = update_curr_idle,
|
2007-07-09 10:51:58 -06:00
|
|
|
};
|