Release 4.15 kernel/sched/idle_task.c
// SPDX-License-Identifier: GPL-2.0
#include "sched.h"
/*
* idle-task scheduling class.
*
* (NOTE: these are not related to SCHED_IDLE tasks which are
* handled in sched/fair.c)
*/
#ifdef CONFIG_SMP
static int
select_task_rq_idle(struct task_struct *p, int cpu, int sd_flag, int flags)
{
return task_cpu(p); /* IDLE tasks as never migrated */
}
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#endif /* CONFIG_SMP */
/*
* Idle tasks are unconditionally rescheduled:
*/
static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int flags)
{
resched_curr(rq);
}
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| Ingo Molnar | 20 | 83.33% | 1 | 25.00% |
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| Kirill V Tkhai | 1 | 4.17% | 1 | 25.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
static struct task_struct *
pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
put_prev_task(rq, prev);
update_idle_core(rq);
schedstat_inc(rq->sched_goidle);
return rq->idle;
}
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| Matt Fleming | 3 | 6.38% | 1 | 16.67% |
| Josh Poimboeuf | 1 | 2.13% | 1 | 16.67% |
| Total | 47 | 100.00% | 6 | 100.00% |
/*
* It is not legal to sleep in the idle task - print a warning
* message if some code attempts to do it:
*/
static void
dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags)
{
raw_spin_unlock_irq(&rq->lock);
printk(KERN_ERR "bad: scheduling from the idle thread!\n");
dump_stack();
raw_spin_lock_irq(&rq->lock);
}
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| Total | 44 | 100.00% | 4 | 100.00% |
static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
{
rq_last_tick_reset(rq);
}
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static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued)
{
}
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static void set_curr_task_idle(struct rq *rq)
{
}
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static void switched_to_idle(struct rq *rq, struct task_struct *p)
{
BUG();
}
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| Peter Zijlstra | 2 | 10.53% | 1 | 50.00% |
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static void
prio_changed_idle(struct rq *rq, struct task_struct *p, int oldprio)
{
BUG();
}
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static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
{
return 0;
}
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static void update_curr_idle(struct rq *rq)
{
}
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| Total | 10 | 100.00% | 1 | 100.00% |
/*
* Simple, special scheduling class for the per-CPU idle tasks:
*/
const struct sched_class idle_sched_class = {
/* .next is NULL */
/* 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,
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_idle,
.set_cpus_allowed = set_cpus_allowed_common,
#endif
.set_curr_task = set_curr_task_idle,
.task_tick = task_tick_idle,
.get_rr_interval = get_rr_interval_idle,
.prio_changed = prio_changed_idle,
.switched_to = switched_to_idle,
.update_curr = update_curr_idle,
};
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| Ingo Molnar | 150 | 42.74% | 2 | 5.88% |
| Peter Zijlstra | 54 | 15.38% | 15 | 44.12% |
| Steven Rostedt | 46 | 13.11% | 1 | 2.94% |
| Gregory Haskins | 26 | 7.41% | 1 | 2.94% |
| Peter Williams | 25 | 7.12% | 3 | 8.82% |
| Thomas Gleixner | 22 | 6.27% | 3 | 8.82% |
| Srivatsa Vaddagiri | 15 | 4.27% | 1 | 2.94% |
| Li Zefan | 4 | 1.14% | 1 | 2.94% |
| Matt Fleming | 3 | 0.85% | 1 | 2.94% |
| Kirill V Tkhai | 1 | 0.28% | 1 | 2.94% |
| Greg Kroah-Hartman | 1 | 0.28% | 1 | 2.94% |
| Borislav Petkov | 1 | 0.28% | 1 | 2.94% |
| H Hartley Sweeten | 1 | 0.28% | 1 | 2.94% |
| Hiroshi Shimamoto | 1 | 0.28% | 1 | 2.94% |
| Josh Poimboeuf | 1 | 0.28% | 1 | 2.94% |
| Total | 351 | 100.00% | 34 | 100.00% |
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