From owner-freebsd-stable@freebsd.org  Sat Feb  3 22:02:18 2018
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Subject: Re: 50 percent swap used, but "ps auxww" output shows no processes
 swapped out
To: Brandon Allbery <allbery.b@gmail.com>, Michael Voorhis <mvoorhis@mcvau.net>
References: <b4f2f623-4d58-a783-4c6b-5138c6dfcf52@mcvau.net>
 <CAKFCL4USAr8ia6bTqK4dXOAGBJmx51MKZDOPyrcD0Gm1WdWQrg@mail.gmail.com>
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From: Eugene Grosbein <eugen@grosbein.net>
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Date: Sun, 4 Feb 2018 05:01:55 +0700
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04.02.2018 4:18, Brandon Allbery wrote:

> (I'm not sure "W" status even means swap; I thought whole-process swapping
> wasn't even supported any more.)

Kernel may decide to swap out entire processes if vm.swap_enabled=1 (default)
and its free page pool heavily stressed or system was configured by administrator
to swap out idle processes proactively using vm.swap_idle_enabled=1 (not default).