On Thu, 10 Mar 2011 15:33:31 -0600 (CST), Christoph Lameter <cl@xxxxxxxxx> wrote: > First establish an RW mapping of the file. > Then -- when you want to take the snapshot -- unmap it and do two mmaps to > the old and new location. Make both readonly and MAP_PRIVATE. That will > cause the kernel to create readonly pages that are subject to COW. I see, that seems reasonable. But what if I was picky and want to snapshot that piece of memory continuously? Let's say once in several minutes, then let some thread to do stuffs to the original using consistent information from the snapshot. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>