1. Seriously analyze mmap: what is it, why and how to use it:
https://www.cnblogs.com/huxiao-tee/p/4660352.html
2. Mmap series 1: Mmap realization principle and application (and comparison with read/fread):
https://blog.csdn.net/don_chiang709/article/details/89332295
3. mmap function: principle and use (including code):
https://www.jianshu.com/p/187eada7b900
4. Analysis and realization of the principle of mmap system call in linux:
https://blog.csdn.net/u013467442/article/details/49722197
5. Memory mapping of Linux device driver:
https://blog.csdn.net/liushuimpc/article/details/8740848