1. Abstract

本文主要讲述和理解虚拟内存（后文简称 VM， VA 等）、Page, TLB 的概念，行文可能较为跳跃，需要特别注意。

2. Virtual Memory

2.1. Abstract

什么是虚拟内存？

Virtual memory is a technique used by operating systems to enable programs to use more memory than is physically available in the system. When a program accesses memory, the address it uses is a virtual address, which is translated by the hardware into a physical address that corresponds to a location in physical memory. This translation process can be slow, especially if it has to be performed every time the program accesses memory.