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用户进程缓冲区与内核缓冲区

http://www.360doc.com/content/18/0512/20/36367108_753420333.shtml

linux中的页缓存和文件IO

https://blog.csdn.net/gdj0001/article/details/80136364

Python零拷贝

https://www.jianshu.com/p/50b58f7a4844

sendfile“零拷贝”和mmap内存映射

https://blog.csdn.net/keil_wang/article/details/86688271