如何在管理不同的页表项(pte)在内核空间和用户空间？
How different in management page table entries (PTE) in kernel space and user space?
来自操作系统的理论，操作系统引入一个页表项，PTE，描述了一个在VAS中的页到物理页的映射。
From Operating System theory, OS implements a page table entry, PTE, to describe a mapping of a page in VAS to physical page.
表项包含真正内存地址的页的虚拟地址，它包括拥有这个页的进程的信息。
Entry consists of the virtual address of the page stored in that real memory location, with information about the process that owns that page.
一个内存中页的表项。
一个内存中页的表项。
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