Re: unconfiguring swap at shutdown

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Sep 02, 2008 at 08:34:57AM +0200, Anders Magnusson wrote:
> Daniel Carosone wrote:
> > On Mon, Sep 01, 2008 at 09:24:19PM -0700, Jason Thorpe wrote:
> >> On Aug 31, 2008, at 12:38 AM, matthew green wrote:
> >>
> >>> swapoff == removing a swap device from use, which means, in the
> >>> current code, brining all those pages back into ram.
> >> Should not matter if all of the processes that would have cared are  
> >> gone.
> > 
> > The trouble is the unkillable buggers, blocking on some resource that
> > will never become available again,  that have gobbled all memory and
> > are the reason for needing the rebbot in the first place. 
> > 
> I would consider that "special cases".  In the common case turning off swap
> at reboot would be a quick thing that should be done.

One quite common case is mfs/tmpfs. You can't umount them before turning
off swap because they may be /dev, and swapoff needs /dev to be mounted.
Turning off swap before unmonting them means bringing back their pages
into ram; with the risk they don't fit in ram ...

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--