说明：  Buddy(伙伴算法)最让人为之激动的在于它释放回收页面过程中将小内存合并成大内存进而减少碎片的功能, 下面让我们来看看释放页面的函数__free_pages_ok()的具体实现.
(Buddy (partner algorithm) was the most exciting is that it will release the process of recovery page at National Cheng Kung University small memory combined to reduce the debris of memory function, following the release of Let s look at the function page __free_pages_ok () concrete realization.)