对32 -位内核而言，有4gb虚地址空间。
随后详细分析怠惰的虚地址空间管理、两级缓冲的物理内存管理；
Secondly, lazy management of virtual address space and management of two-layer-cached physical memory are analyzed.
当前，POWER上的Linux允许内核使用4gb虚地址空间，允许用户应用程序使用最多4gb虚地址空间。
Currently, Linux on POWER allows 4gb for the kernel and up to 4gb virtual address space for user applications.
内存映射被用于将映像和数据文件映射到一个进程的虚拟地址空间中，也就是将文件内容直接地连接到虚地址中。
Memory mapping is used to map image and data files into a processes address space. In memory mapping, the contents of a file are linked directly into the virtual address space of a process.
内存映射被用于将映像和数据文件映射到一个进程的虚拟地址空间中，也就是将文件内容直接地连接到虚地址中。
Memory mapping is used to map image and data files into a processes address space. In memory mapping, the contents of a file are linked directly into the virtual address space of a process.
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