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。

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In the standard 2.6 Linux kernel, when a user space process makes a call into the kernel (through a system call), it cannot be preempted.

在标准2.6 Linux内核中，当用户空间的进程执行内核调用时(通过系统调用)，它便不能被抢占。

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