linux-kernel - Re: [TuxOnIce-devel] [RFC] TuxOnIce

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Message-Id: <1243373613.13930.61.camel@nigel-laptop>
Date:	Wed, 27 May 2009 07:33:33 +1000
From:	Nigel Cunningham <nigel@...onice.net>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org,
	tuxonice-devel@...ts.tuxonice.net, linux-kernel@...r.kernel.org
Subject: Re: [TuxOnIce-devel] [RFC] TuxOnIce

Hi.

On Tue, 2009-05-26 at 13:07 +0200, Oliver Neukum wrote:
> Am Dienstag, 26. Mai 2009 11:19:40 schrieb Pavel Machek:
> 
> Hello,
> 
> > For small allocations... I still believe we should free a bit of
> > memory for s2ram so that small allocations can be done without
> > problems.
> > 									Pavel
> 
> it is essential that this work. Some subsystems, ie. USB, need to allocate
> memory to do IO. For them to work, small allocations must be possible.
> 
> Now, is this a real issue? Can most devices really save a device state?
> This capability seems to me to be limited to memory mapped IO at best.
> USB devices generally don't save and restore state but bring the device
> into the state it ought to be in, not the state it was in during resumption.

USB devices ought to be able to do _something_ though - I have a Dvico
Dual Digital 4 card that is forcing me to shutdown X, mythtv-backend,
pulse audio and lirc at the moment so that I can rmmod it while
hibernating. That ought not be necessary. I'm sure there are good
technical reasons why it is necessary at the mooment, but it shouldn't
be that way - even if it just does the bare minimum required to avoid
requiring the closing of files and the unload.

Regards,

Nigel

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