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Some SMP applications have threading designs where every thread created is always assigned to a specific CPU, and never want to schedule them symmetrically across CPUs under any circumstance. In this situation, it's possible to optimize the run queue design a bit to put a separate queue in each CPU struct instead of having a single global one. This is probably good for a few cycles per scheduling event (maybe a bit more on architectures where cache locality can be exploited) in circumstances where there is more than one runnable thread. It's a mild optimization, but a basically simple one. Signed-off-by: Andy Ross <andrew.j.ross@intel.com>