It's entirely possible to do this at the OS level. It makes the scheduling problem much harder, yes, but a user can—for example—force their game to run only in

It's entirely possible to do this at the OS level. It makes the scheduling problem much harder, yes, but a user can—for example—force their game to run only in one domain using CPU affinity, then somehow trigger the kernel to migrate all its memory to that domain. I know how to do the former, I haven't tried the latter. It would be more difficult to do it automatically, but if NUMA systems become more common then I see no reason why it shouldn't be tried.