3.9 Describe the actions token by a kernel to content-switch between processes.

答案：

　　内核在进行进程上下文切换时， 首先将当前进程的上下文保存在内存中的PCB中， 然后再将下一个进程在内存中的PCB里的上下文读取出来。 上下文包含CPU寄存器里的内容， 堆， 用户栈， 内存管理信息， 数据， 文本。

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