If I'm understanding correctly, the two core limit is only for initially waking the process, after which normal load balancing can move it elsewhere if necessary. There's a benefit to sticking to one of the two same hyper threaded CPUs in terms of cache, so this does make sense even on 32 core machines.
Yes, however I think you can get a 15-puzzle situation - even if you do this only for waking the process - when you wake a lot of process at the same time on a machine with many cores.
I really prefer Linus suggestion, even if it's the hardest.
