分页是为了使页面大小适合设备缓冲可接受的限制而将单个页面分解成多个页面的过程。
Pagination is the process of breaking a single page into multiple pages in order to fit the page size within acceptable limits of the device buffer.
根据设备驱动程序的不同，如果设备具有缓冲区，可能需要使用一个缓冲区的拷贝。
Depending on your device driver, you may need to have a copy of the buffers, if the device has any.
缓冲区缓存之下是设备驱动程序，它实现了特定物理设备的接口。
Below the buffer cache are the device drivers, which implement the interface for the particular physical device.
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