[Bug 197922] [patch] [sched] Remove random() from sched_ule, add short circuit for non-SMP, non-balancing

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197922

            Bug ID: 197922
           Summary: [patch] [sched] Remove random() from sched_ule, add
                    short circuit for non-SMP, non-balancing
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: harrison.grundy at astrodoggroup.com

Created attachment 153317
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153317&action=edit
Replace random with get_cyclecount as a suitable source of entropy for the
balancer. Short circuit for non-SMP/Balance

As discovered by John-Mark Gurney, ULE uses random() which is not
SMP/preemption safe. 

Move the check for SMP and Balancer being enabled above the generation of the
balancing interval.

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