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)。
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。
The virtual memory pages whose page frames are to be reassigned are selected using the VMM's page replacement algorithm.
可以使用 VMM 的页面置换算法来选择要重新分配页帧的虚拟内存页面。
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