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stop_sched_class在内核中有什么用?在pick_next_task函数中,调度程序将从第一个任务中选择下一个任务stop_sched_classsched_class我为内核删除这个有什么问题吗?

#define for_each_class(class) \
   for (class = sched_class_highest; class; class = class->next)


#define sched_class_highest (&stop_sched_class)
extern const struct sched_class stop_sched_class;

/*
 * 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,
};
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1 回答 1

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stop_sched_class 用于停止 cpu,在 SMP 系统上使用,用于负载平衡和 cpu hotplug。此类具有最高的调度优先级。

如果你的系统没有定义CONFIG_SMP,可以尝试去掉这个类,有几个文件需要修改才能编译成功。

于 2013-03-15T02:30:35.113 回答