移动内存页面的速度比mremap（）更快？

I've been experimenting with mremap(). I'd like to be able to move virtual memory pages around at high speeds. At least higher speeds than copying them. I have some ideas for algorithms which could make use of being able to move memory pages really fast. Problem is that the program below shows that mremap() is very slow -- at least on my i7 laptop -- compared to actually copying the same memory pages byte by byte.I've been experimenting with mremap(). I'd like