数据高速缓存区(data buffer cache):存放着系统最近使用的数据块。它有3种类型:脏区(dirty buffers, 已经修改需要写回数据文件的数据块),自由区(free buffer...
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在读取方面使用中间内核缓冲区,可以允许内核缓冲区在应用程序不需要内核缓冲区内的全部数据时,充当 “预读高速缓存(readahead cache)” 的角色。
Using the intermediate buffer on the read side allows the kernel buffer to act as a "readahead cache" when the application hasn't asked for as much data as the kernel buffer holds.
如果数据一段时间未被使用,将最终从高速缓存区释放,将由新的数据代替。
Data that has not been used for a while is eventually released from the cache to make room for new data.
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