linux-kernel - Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Message-Id: <1180563699.6777.6.camel@nigel.suspend2.net>
Date:	Thu, 31 May 2007 08:21:39 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>, Pavel Machek <pavel@....cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi.

On Wed, 2007-05-30 at 16:04 +0200, Rafael J. Wysocki wrote:
> 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.

True. I understood, perhaps wrongly, that when Matthew spoke of keeping
the drivers layers read-only, he was meaning stopping filesystem changes
by some other means.

Regards,

Nigel

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