Contributors: 18
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Peter Zijlstra |
249 |
62.72% |
19 |
46.34% |
| Ingo Molnar |
53 |
13.35% |
4 |
9.76% |
| Nicholas Piggin |
13 |
3.27% |
1 |
2.44% |
| Mike Galbraith |
10 |
2.52% |
1 |
2.44% |
| Linus Torvalds |
9 |
2.27% |
1 |
2.44% |
| Kirill V Tkhai |
8 |
2.02% |
2 |
4.88% |
| Thomas Gleixner |
8 |
2.02% |
1 |
2.44% |
| Paul Turner |
8 |
2.02% |
1 |
2.44% |
| Srivatsa Vaddagiri |
8 |
2.02% |
1 |
2.44% |
| Rick Lindsley |
7 |
1.76% |
1 |
2.44% |
| Frédéric Weisbecker |
6 |
1.51% |
2 |
4.88% |
| Mathieu Desnoyers |
5 |
1.26% |
1 |
2.44% |
| Joel A Fernandes |
5 |
1.26% |
1 |
2.44% |
| Matt Fleming |
3 |
0.76% |
1 |
2.44% |
| Steven Rostedt |
2 |
0.50% |
1 |
2.44% |
| Borislav Petkov |
1 |
0.25% |
1 |
2.44% |
| Shang XiaoJing |
1 |
0.25% |
1 |
2.44% |
| Greg Kroah-Hartman |
1 |
0.25% |
1 |
2.44% |
| Total |
397 |
|
41 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* stop-task scheduling class.
*
* The stop task is the highest priority task in the system, it preempts
* everything and will be preempted by nothing.
*
* See kernel/stop_machine.c
*/
#include "sched.h"
static int
select_task_rq_stop(struct task_struct *p, int cpu, int flags)
{
return task_cpu(p); /* stop tasks as never migrate */
}
static int
balance_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
return sched_stop_runnable(rq);
}
static void
wakeup_preempt_stop(struct rq *rq, struct task_struct *p, int flags)
{
/* we're never preempted */
}
static void set_next_task_stop(struct rq *rq, struct task_struct *stop, bool first)
{
stop->se.exec_start = rq_clock_task(rq);
}
static struct task_struct *pick_task_stop(struct rq *rq, struct rq_flags *rf)
{
if (!sched_stop_runnable(rq))
return NULL;
return rq->stop;
}
static void
enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags)
{
add_nr_running(rq, 1);
}
static bool
dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags)
{
sub_nr_running(rq, 1);
return true;
}
static void yield_task_stop(struct rq *rq)
{
BUG(); /* the stop task should never yield, its pointless. */
}
static void put_prev_task_stop(struct rq *rq, struct task_struct *prev, struct task_struct *next)
{
update_curr_common(rq);
}
/*
* scheduler tick hitting a task of our scheduling class.
*
* NOTE: This function can be called remotely by the tick offload that
* goes along full dynticks. Therefore no local assumption can be made
* and everything must be accessed through the @rq and @curr passed in
* parameters.
*/
static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued)
{
}
static void switching_to_stop(struct rq *rq, struct task_struct *p)
{
BUG(); /* its impossible to change to this class */
}
static void
prio_changed_stop(struct rq *rq, struct task_struct *p, u64 oldprio)
{
if (p->prio == oldprio)
return;
BUG(); /* how!?, what priority? */
}
static void update_curr_stop(struct rq *rq)
{
}
/*
* Simple, special scheduling class for the per-CPU stop tasks:
*/
DEFINE_SCHED_CLASS(stop) = {
.enqueue_task = enqueue_task_stop,
.dequeue_task = dequeue_task_stop,
.yield_task = yield_task_stop,
.wakeup_preempt = wakeup_preempt_stop,
.pick_task = pick_task_stop,
.put_prev_task = put_prev_task_stop,
.set_next_task = set_next_task_stop,
.balance = balance_stop,
.select_task_rq = select_task_rq_stop,
.set_cpus_allowed = set_cpus_allowed_common,
.task_tick = task_tick_stop,
.prio_changed = prio_changed_stop,
.switching_to = switching_to_stop,
.update_curr = update_curr_stop,
};