[$] Core scheduling

Kernel developers are used to having to defend their work when posting itto the mailing lists, so when a longtime kernel developer describes theirown work as "expensive and nasty", one tends to wonder what is going on. The patch set in question is corescheduling from Peter Zijlstra. It is intended to make simultaneousmultithreading (SMT) usable on systems where cache-based side channels area concern, but even its author is far from convinced that it shouldactually become part of the kernel.