那一望无尽天空

摘要： 普通文件I/O 第一次复制：disk->page cache，从磁盘到页缓存（外存到主存） 第二次复制：page cache->process heap，从页缓存到进程堆空间（即内核态到用户态） 内存映射文件mmap disk->page cache，从磁盘到页缓存（外存到主存） 参考： https 阅读全文

摘要： What is the major difference between the buffer cache and the page cache? Why were they separate entities in older kernels? Why were they merged later 阅读全文