[$] Cache awareness for the CPU scheduler

The kernel's CPU scheduler has to balance a wide range of objectives. The
tasks in the system must be scheduled fairly, with latency for any given
task kept within bounds. All of the CPUs in the system should be kept busy
if there is enough work to do, but unneeded CPUs should be shut down to
reduce power consumption. A task should also run on the CPU that is most
likely to have cached the memory that task is using. This patch
series from Chen Yu aims to improve how the scheduler handles cache
locality for multi-threaded processes.