Change top's notion of idle processes / threads

[John Baldwin]

On Friday, May 23, 2014 4:39:39 pm Poul-Henning Kamp wrote:
> In message <201405231605.26312.jhb at freebsd.org>, John Baldwin writes:
> 
> >In essence, top will consider any thread that has run on a CPU 
> >since the last update as non-idle.
> 
> Sounds a lot more usable than the current heuristic.
> 
> Wouldn't ki_rusage.ru_n[i]vcsw be more correct than ki_runtime ?

I went ahead and checked for both.  In theory we might fix our scheduler
one day to notice when a CPU is dedicated to a single thread not bother
with doing silly context switches back to itself in which case only
ki_runtime would change.

-- 
John Baldwin