On the non-x86 side, ARM has had this for a VERY long time. Certainly at last since ARMv7-A onward, and I think even before that.<p>Pretty much any core in &quot;Cortex-A&quot; series (e.g popular Cortex-A8, A15, A57) has support for fast, flush-less address space switching using ASIDs. Address space &#x2F; context switch overhead has NOT been a good reason to avoid this kind of compartmentalization, for at least the last decade or so.