Improve the SMP scheduler with arbitrary processor affinity support

Original author: sebastian.huber

The SMP scheduler with arbitrary processor affinity support uses a proof of concept implementation.

A potentially more efficient implementation is available here:

F. Cerqueira, A. Gujarati, and B. Brandenburg, "Linux’s Processor Affinity API, Refined: Shifting Real-Time Tasks towards Higher Schedulability", Proceedings of the 35th IEEE Real-Time Systems Symposium (RTSS 2014), pp. 249-259, December 2014.

http://www.mpi-sws.org/~bbb/papers/pdf/rtss14f.pdf http://www.mpi-sws.org/~bbb/papers/talks/rtss14f.pdf