The first page of virtual memory in the kernel address space can be accessed by kernel code, but is marked as read-only.

内核地址空间中的第一页虚拟内存可通过内核代码访问，但是被标记为只读。

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The mapping of virtual memory to physical memory occurs through page tables, which are implemented in the underlying hardware (see Figure 1).

虚拟内存到物理内存的映射通过页表完成，这是在底层软件中实现的(见图1)。

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From here, you can determine that its objectives are to help minimize both the response time of page faults and to decrease the use of virtual memory where it can.

由此可以看出，它的目标是帮助最大限度地缩短缺页响应时间，并在可能的情况下减少虚拟内存的使用。

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