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been in development for over 6 months as SCHED_SMP. - Implement one spin lock per thread-queue. Threads assigned to a run-queue point to this lock via td_lock. - Improve the facility for assigning threads to CPUs now that sched_lock contention no longer dominates scheduling decisions on larger SMP machines. - Re-write idle time stealing in an attempt to make it less damaging to general performance. This is still disabled by default. See kern.sched.steal_idle. - Call the long-term load balancer from a callout rather than sched_clock() so there are no locks held. This is disabled by default. See kern.sched.balance. - Parameterize many scheduling decisions via sysctls. Try to document these via sysctl descriptions. - General structural and naming cleanups. - Document each function with comments. Tested by: current@ amd64, x86, UP, SMP. Approved by: re
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