FILE MOVEMENT METHOD SUPPORTING DATA ZERO-COPY TECHNIQUE

摘要

A method for moving a file without copying data is provided to enhance whole performance with reduction of CPU load and costs for copying the data to a user area by moving the file between a source and target device with a buffer page shared in a kernel area. A file moving request is received from an application providing of the user area. The buffer page for the source device is allocated in the kernel area(401). The data of the moved file stored in the source device is copied to the buffer page in a DMA(Direct Memory Access) mode(402). The buffer page is removed from a cache and page management information is changed to allocate the buffer page to the target device(405). The data of the buffer page is copied to the target device in the DMA mode(406).