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Date: Mon, 26 Jan 2009 14:03:10 -0500
From: David Schultz <das@FreeBSD.ORG>
To: Bruce Evans <brde@optusnet.com.au>
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Cc: svn-src-head@FreeBSD.ORG, Ed Schouten <ed@80386.nl>,
	svn-src-all@FreeBSD.ORG, src-committers@FreeBSD.ORG,
	Tom Rhodes <trhodes@FreeBSD.ORG>
Subject: Re: svn commit: r187607 - head/usr.bin/truss
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On Mon, Jan 26, 2009, Bruce Evans wrote:
> - P_SYSTEM has something to do with swapping, and I also removed the
>   PS_INMEM setting for init.  I have always used NO_SWAPPING and haven't
>   used a swap partition since memory sizes reached 64MB, so I wouldn't
>   have noticed problems with this.  init doesn't run often so it is
>   quite likely to be swapped (if allowed to) if real memory runs out.

Process kstack swapping was removed several years ago, so
"swapping out" a process just deactivates all of its pages.
In principle this could be safe to do with init, but it's probably
a bad idea, and perhaps could lead to deadlock in the
out-of-swap-space -> kill a process -> reparent the zombie to init
path. PS_INMEM will prevent init from being swapped out.