> For the complete documentation index, see [llms.txt](https://richardweiyang-2.gitbook.io/kernel-exploring/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://richardweiyang-2.gitbook.io/kernel-exploring/nei-cun-guan-li/00-index/19-rmap.md).

# 反向映射

反向映射是一种知道物理页，要找到哪些进程映射了本物理页的方法。

```
Reverse map is one of the feature in linux kernel, which with given a physical
page, can return a list of PTEs which point to that page.
```

反向映射包括了"[匿名页反向映射](/kernel-exploring/nei-cun-guan-li/00-index/19-rmap/01-anon_rmap_history.md)"和"文件页反向映射"，原因是匿名页没有后盾，而文件页有。

除了内核中是如何实现反向映射的，通常我们看到的是如何[使用反向映射](/kernel-exploring/nei-cun-guan-li/00-index/19-rmap/20-rmap_walk.md).