Change top's notion of idle processes / threads

[Poul-Henning Kamp]

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 ?

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