Right now, when top is set to not display idle processes or threads, it only
displays processes or threads that are currently in a runnable state or have a
non-zero %cpu. However, our %cpu is quite imprecise. I have patch to change
top to instead compare the thread or processes runtime (ki_runtime in
kinfo_proc) against the runtime of the thread or process the last time data
was fetched. In essence, top will consider any thread that has run on a CPU
since the last update as non-idle. The end result is that mostly-idle threads
and processes will now be visible in top's idle display. Personally, I find
this more useful (and find the current implementation completely useless).
The patch is at http://people.freebsd.org/~jhb/patches/top_idle.patch
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