bzero is over, memset is cool.  pointed out by halex@
Add more examples.  Requested by deraadt@
Revert "adjust -C algorithm to be more aggressive in scaling up" for
the moment, it triggers a race that breaks suspend/resume on some
machines.

ok tedu@, deraadt@, jsg@
If we're stopping a secondary cpu, don't let sched_choosecpu() short-circuit
and return the current current CPU, otherwise sched_stop_secondary_cpus()
will spin forever trying to empty its run queues.  Fixes hangs during suspend
that many people reported over the last couple of days.

ok bcook@, guenther@
Remove redundant slash