Not a lot of technical specificity around "memory compression". <i>Edit:</i> Ok, I stand corrected, somebody's done some research and found the code.<p>Windows 8 does a similar-sounding trick. At some timer interrupts they de-dupe pages and make them copy-on-write when they are identical. I seem to recall also reading that some VM products (VMware?) do this - so if you have a few instances of the same OS, only unique pages end up getting stored.<p>From the presentation I wonder if they're doing this, or if they might be putting the pages through a compression algorithm. (I hear "compression" and I think this, but it seems like that would make page faults needlessly costly.)