Release 4.15 kernel/sched/stop_task.c
// SPDX-License-Identifier: GPL-2.0
#include "sched.h"
/*
* 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
*/
#ifdef CONFIG_SMP
static int
select_task_rq_stop(struct task_struct *p, int cpu, int sd_flag, int flags)
{
return task_cpu(p); /* stop tasks as never migrate */
}
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| Peter Zijlstra | 27 | 100.00% | 2 | 100.00% |
| Total | 27 | 100.00% | 2 | 100.00% |
#endif /* CONFIG_SMP */
static void
check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
{
/* we're never preempted */
}
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| Peter Zijlstra | 20 | 100.00% | 2 | 100.00% |
| Total | 20 | 100.00% | 2 | 100.00% |
static struct task_struct *
pick_next_task_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
{
struct task_struct *stop = rq->stop;
if (!stop || !task_on_rq_queued(stop))
return NULL;
put_prev_task(rq, prev);
stop->se.exec_start = rq_clock_task(rq);
return stop;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 49 | 73.13% | 3 | 42.86% |
| Mike Galbraith | 9 | 13.43% | 1 | 14.29% |
| Matt Fleming | 3 | 4.48% | 1 | 14.29% |
| Frédéric Weisbecker | 3 | 4.48% | 1 | 14.29% |
| Kirill Tkhai | 3 | 4.48% | 1 | 14.29% |
| Total | 67 | 100.00% | 7 | 100.00% |
static void
enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags)
{
add_nr_running(rq, 1);
}
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| Peter Zijlstra | 17 | 65.38% | 1 | 33.33% |
| Paul Turner | 6 | 23.08% | 1 | 33.33% |
| Kirill V Tkhai | 3 | 11.54% | 1 | 33.33% |
| Total | 26 | 100.00% | 3 | 100.00% |
static void
dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags)
{
sub_nr_running(rq, 1);
}
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| Peter Zijlstra | 17 | 65.38% | 1 | 33.33% |
| Paul Turner | 6 | 23.08% | 1 | 33.33% |
| Kirill V Tkhai | 3 | 11.54% | 1 | 33.33% |
| Total | 26 | 100.00% | 3 | 100.00% |
static void yield_task_stop(struct rq *rq)
{
BUG(); /* the stop task should never yield, its pointless. */
}
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| Peter Zijlstra | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
{
struct task_struct *curr = rq->curr;
u64 delta_exec;
delta_exec = rq_clock_task(rq) - curr->se.exec_start;
if (unlikely((s64)delta_exec < 0))
delta_exec = 0;
schedstat_set(curr->se.statistics.exec_max,
max(curr->se.statistics.exec_max, delta_exec));
curr->se.sum_exec_runtime += delta_exec;
account_group_exec_runtime(curr, delta_exec);
curr->se.exec_start = rq_clock_task(rq);
cgroup_account_cputime(curr, delta_exec);
}
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| Mike Galbraith | 93 | 81.58% | 1 | 25.00% |
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| Frédéric Weisbecker | 6 | 5.26% | 1 | 25.00% |
| Tejun Heo | 1 | 0.88% | 1 | 25.00% |
| Total | 114 | 100.00% | 4 | 100.00% |
static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued)
{
}
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| Peter Zijlstra | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
static void set_curr_task_stop(struct rq *rq)
{
struct task_struct *stop = rq->stop;
stop->se.exec_start = rq_clock_task(rq);
}
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| Mike Galbraith | 19 | 61.29% | 1 | 33.33% |
| Peter Zijlstra | 9 | 29.03% | 1 | 33.33% |
| Frédéric Weisbecker | 3 | 9.68% | 1 | 33.33% |
| Total | 31 | 100.00% | 3 | 100.00% |
static void switched_to_stop(struct rq *rq, struct task_struct *p)
{
BUG(); /* its impossible to change to this class */
}
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| Peter Zijlstra | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static void
prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio)
{
BUG(); /* how!?, what priority? */
}
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| Peter Zijlstra | 23 | 100.00% | 1 | 100.00% |
| Total | 23 | 100.00% | 1 | 100.00% |
static unsigned int
get_rr_interval_stop(struct rq *rq, struct task_struct *task)
{
return 0;
}
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| Peter Zijlstra | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static void update_curr_stop(struct rq *rq)
{
}
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| Thomas Gleixner | 10 | 100.00% | 1 | 100.00% |
| Total | 10 | 100.00% | 1 | 100.00% |
/*
* Simple, special scheduling class for the per-CPU stop tasks:
*/
const struct sched_class stop_sched_class = {
.next = &dl_sched_class,
.enqueue_task = enqueue_task_stop,
.dequeue_task = dequeue_task_stop,
.yield_task = yield_task_stop,
.check_preempt_curr = check_preempt_curr_stop,
.pick_next_task = pick_next_task_stop,
.put_prev_task = put_prev_task_stop,
#ifdef CONFIG_SMP
.select_task_rq = select_task_rq_stop,
.set_cpus_allowed = set_cpus_allowed_common,
#endif
.set_curr_task = set_curr_task_stop,
.task_tick = task_tick_stop,
.get_rr_interval = get_rr_interval_stop,
.prio_changed = prio_changed_stop,
.switched_to = switched_to_stop,
.update_curr = update_curr_stop,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Zijlstra | 341 | 65.96% | 7 | 38.89% |
| Mike Galbraith | 121 | 23.40% | 1 | 5.56% |
| Thomas Gleixner | 15 | 2.90% | 1 | 5.56% |
| Paul Turner | 12 | 2.32% | 1 | 5.56% |
| Frédéric Weisbecker | 12 | 2.32% | 1 | 5.56% |
| Kirill V Tkhai | 6 | 1.16% | 1 | 5.56% |
| Kirill Tkhai | 3 | 0.58% | 1 | 5.56% |
| Matt Fleming | 3 | 0.58% | 1 | 5.56% |
| Greg Kroah-Hartman | 1 | 0.19% | 1 | 5.56% |
| Tejun Heo | 1 | 0.19% | 1 | 5.56% |
| Dario Faggioli | 1 | 0.19% | 1 | 5.56% |
| Borislav Petkov | 1 | 0.19% | 1 | 5.56% |
| Total | 517 | 100.00% | 18 | 100.00% |
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