Shared memory allows multiple processes to map a portion of their virtual address to a common memory region.
共享内存允许多个进程将它们的部分虚地址映射到一个公用的内存区域。
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。
Every time a memory location is addressed for program instructions or data, a virtual address is translated into a physical or real memory address.
每次为程序指令或数据处理内存位置时，都需要将虚拟地址转换成物理(或实际)内存地址。
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