 - Fix a comparison in sched_choose() that caused cpus to be constantly    marked idle, thus breaking cpu load balancing.  - Change sched_interact_update() to fix cases where the stored history    has expanded significantly rather than handling them in the callers.  This    fixes a case where sched_priority() could compute a bad value.  - Add a sysctl to disable the global load balancer for experimentation.
 - Fix a comparison in sched_choose() that caused cpus to be constantly
   marked idle, thus breaking cpu load balancing.
 - Change sched_interact_update() to fix cases where the stored history
   has expanded significantly rather than handling them in the callers.  This
   fixes a case where sched_priority() could compute a bad value.
 - Add a sysctl to disable the global load balancer for experimentation.

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