From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: nigel@nigel.suspend2.net
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review
Date: Wed, 30 May 2007 16:04:22 +0200
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Cc: Matthew Garrett <mjg59@srcf.ucam.org>, Pavel Machek <pavel@ucw.cz>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <alpine.LFD.0.98.0705241905490.26602@woody.linux-foundation.org> <20070530124027.GA27942@srcf.ucam.org> <1180531067.24891.1.camel@nigel.suspend2.net>
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On Wednesday, 30 May 2007 15:17, Nigel Cunningham wrote:
> On Wed, 2007-05-30 at 13:40 +0100, Matthew Garrett wrote:
> > On Wed, May 30, 2007 at 01:49:21PM +0200, Pavel Machek wrote:
> > 
> > (Trimmed the Cc:s quite heavily - I think this has gone somewhere beyond 
> > the original point)
> > 
> > > Notice that we want to be able to suspend while hibernating -- for
> > > suspend to both behaviour. So drivers may _not_ rely on system being
> > > runnable.
> > 
> > So keep the driver layers read-only and unfreeze the processes after 
> > doing the atomic copy.
> 
> I know you probably won't care, but that's not an option for Suspend2 -
> I get the possibility of a full image by overwriting LRU pages that were
> saved prior to the atomic copy.

This generally is a problem, not only for suspend2. :-)

Once you've unfrozen the user land, we can't rely on the hibernation image any
more, because some tasks may cause the on-disk filesystems' state to change.

Greetings,
Rafael
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