On Wed, Jan 27, 2021 at 09:18:48AM +0000, Paul Guo wrote: > Second one is use copy_file_range() for the local rewind case to replace > read()+write(). > This introduces copy_file_range() check and HAVE_COPY_FILE_RANGE so other > code could use copy_file_range() if needed. copy_file_range() was introduced > In high-version Linux Kernel, in low-version Linux or other Unix-like OS > mmap() > might be better than read()+write() but copy_file_range() is more interesting > given that it could skip the data copying in some file systems - this could > benefit more > on Linux fs on network-based block storage.
Have you done some measurements? -- Michael
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