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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-11-15 16:14:39 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-11-17 11:20:22 (GMT) |
commit | 391e43da797a96aeb65410281891f6d0b0e9611c (patch) | |
tree | 0ce6784525a5a8f75b377170cf1a7d60abccea29 /kernel/sched/stop_task.c | |
parent | 029632fbb7b7c9d85063cc9eb470de6c54873df3 (diff) | |
download | linux-391e43da797a96aeb65410281891f6d0b0e9611c.tar.xz |
sched: Move all scheduler bits into kernel/sched/
There's too many sched*.[ch] files in kernel/, give them their own
directory.
(No code changed, other than Makefile glue added.)
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched/stop_task.c')
-rw-r--r-- | kernel/sched/stop_task.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c new file mode 100644 index 0000000..7b386e8 --- /dev/null +++ b/kernel/sched/stop_task.c @@ -0,0 +1,108 @@ +#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 sd_flag, int flags) +{ + return task_cpu(p); /* stop tasks as never migrate */ +} +#endif /* CONFIG_SMP */ + +static void +check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags) +{ + /* we're never preempted */ +} + +static struct task_struct *pick_next_task_stop(struct rq *rq) +{ + struct task_struct *stop = rq->stop; + + if (stop && stop->on_rq) + return stop; + + return NULL; +} + +static void +enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) +{ + inc_nr_running(rq); +} + +static void +dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) +{ + dec_nr_running(rq); +} + +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) +{ +} + +static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued) +{ +} + +static void set_curr_task_stop(struct rq *rq) +{ +} + +static void switched_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, int oldprio) +{ + BUG(); /* how!?, what priority? */ +} + +static unsigned int +get_rr_interval_stop(struct rq *rq, struct task_struct *task) +{ + return 0; +} + +/* + * Simple, special scheduling class for the per-CPU stop tasks: + */ +const struct sched_class stop_sched_class = { + .next = &rt_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, +#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, +}; |