《Operating System Concepts》学习第 50 天，p584-p585 总结，总计 2 页。

一、技术总结

1.double caching

The problem in which the same data might be in two different caches; solved by a unified buffer cache.

2.free-behind

Sequential I/O performance optimization that removes a page or block from a buffer as soon as I/O to the next page is requested.

二、英语总结(生词：0)

无。

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。

三、其它

今天没有什么想说的。

四、参考资料

1. 编程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英语

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

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