Despite years of talk about heterogeneous computing, I don't think there are any production kernels for any general-purpose operating system that are instructio

Despite years of talk about heterogeneous computing, I don't think there are any production kernels for any general-purpose operating system that are instruction-set-feature aware. Linux and Windows both have partitioned schedulers, available through per-process and per-thread affinity masks. So it doesn't seem like it should be all that hard to implement. Its "just" a matter of expressing the process's (thread's?) requirements.