MFC r352728: Microoptimize sched_pickcpu() CPU affinity on SMT.
Use of CPU_FFS() to implement CPUSET_FOREACH() allows to save up to ~0.5%
of CPU time on 72-thread SMT system doing 80K IOPS to NVMe from one thread.
MFC r352728: Microoptimize sched_pickcpu() CPU affinity on SMT. Tags None Referenced Files None Subscribers None
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