I was reading through ps.1, which has two slightly different options
     -H      Also display information about kernel visible threads.
     -k      Also display information about kernel threads.


It's not at all obvious what the difference between these options might be.

>From the log:
--------------------
revision 1.77
date: 2011/09/25 00:29:59;  author: guenther;  state: Exp;  lines: +5 -3;
Add -H option to show rthreads, hiding them by default

Diff from uwe@
--------------------
so slightly more info.

Looking at the code, now this is KERN_PROC_KTHREAD vs KERN_PROC_SHOW_THREADS
in kvm_getprocs(3).

Now KERN_PROC_KTHREAD is documented, but there is nothing about
KERN_PROC_SHOW_THREADS.

The code around (dothreads) in kvm* doesn't make things really obvious.

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