Dequeue_task: When a task is no longer runnable, this function is called to keep the corresponding scheduling entity out of the red-black tree. It decrements the nr_running variable.

dequeue _ task：当某个任务退出可运行状态时调用该函数，它将从红黑树中去掉对应的调度实体，并从nr_running变量中减1。

youdao

The currently running task (now preempted) is returned to the red-black tree through a call to put_prev_task (via the scheduling class).

当前运行任务(现在被抢占的任务)通过对put _ prev_task调用(通过调度类)返回到红黑树。

youdao

It puts the scheduling entity (process) into the red-black tree and increments the nr_running variable.

它将调度实体(进程)放入红黑树中，并对nr_running变量加1。

youdao