To understand the reverse mapping technique, let's quickly go through some fundamentals of the Linux virtual memory system.

为了理解反向映射技术，让我们来首先简单了解Linux虚拟内存系统的一些基本原理。

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msync(): Used to synchronize a shared memory segment with the file system—a technique useful when mapping a file into memory.

msync()：用来让共享内存段与文件系统同步 — 当把文件映射到内存时，这种技术有用。

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