每个进程是否存在内核堆栈? [英] Does there exist Kernel stack for each process ?

问题描述

每个用户空间进程是否存在内核堆栈和用户空间堆栈?如果两个堆栈都存在，那么每个用户空间进程应该有 2 个堆栈指针，对吧?

Does there exist a Kernel stack and a user-space stack for each user space process? If both stacks exist, there should be 2 stack pointers for each user space process right?

推荐答案

在 Linux 中，每个任务(用户空间或内核线程)都有一个 8kb 或 4kb 的内核堆栈，具体取决于内核配置.确实有单独的堆栈指针，但是，在任何给定时间，CPU 中都只有一个；如果用户空间代码正在运行，则用于异常或中断的内核堆栈指针由任务状态段指定，如果内核代码正在运行，则用户堆栈指针保存在位于内核堆栈上的上下文结构中.

In Linux, each task (userspace or kernel thread) has a kernel stack of either 8kb or 4kb, depending on kernel configuration. There are indeed separate stack pointers, however, only one is present in the CPU at any given time; if userspace code is running, the kernel stack pointer to be used on exceptions or interrupts is specified by the task-state segment, and if kernel code is running, the user stack pointer is saved in the context structure located on the kernel stack.

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