对32 -位内核而言，有4gb虚地址空间。
在本文的许多例子中，内存虚地址的概念经常会被用到。
In most examples in this paper, the virtual (linear) addresses are used.
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。
Shared memory allows multiple processes to map a portion of their virtual address to a common memory region.
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.
内存管理单位，把虚地址转化为物理地址并且提供访问许可控制。
MMU Memory Management Unit, translates virtual to physical addresses and provides access permission control.
在所有的现代操作系统中，系统都是使用虚地址去访问内存单元的。
All modern operating systems, including Linux, use this kind of addresses to access the contents of memory cells.
MMU的功能是控制各种存储系统的工作并将虚地址转换成物理地址，以及控制存储器访问权限。
The functions of the MMU are to control the various memory systems, translate the virtual addresses into physical addresses and control the access permission.
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.
编译器可以使用间接调用执行优化，如提升循环外虚方法地址的加载。
The compiler can perform optimizations with indirect calls such as hoisting the load of a virtual method address out of a loop.
利用网络中未使用IP地址构建扫描检测平台能够有效提高检测准确率，降低虚警率。
A scan detection platform constructed by unused IP addresses will effectively improve detection accuracy and reduce false alarm.
对应与物理网络地址又提出了虚网络地址。
This article proposes virtual network address corresponding to physical network address, too.
编译器用正确的函数地址初始化这些虚函数表。
The compiler initializes these tables with the correct function addresses.
编译器用正确的函数地址初始化这些虚函数表。
The compiler initializes these tables with the correct function addresses.
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