linux-kernel - Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

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Message-Id: <200709212215.57526.nigel@nigel.suspend2.net>
Date:	Fri, 21 Sep 2007 22:15:54 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, nigel@...pend2.net,
	Pavel Machek <pavel@....cz>,
	"Huang, Ying" <ying.huang@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

Hi.

On Friday 21 September 2007 22:18:19 Rafael J. Wysocki wrote:
> On Friday, 21 September 2007 13:58, Nigel Cunningham wrote:
> > Hi.
> > 
> > On Friday 21 September 2007 21:56:29 Rafael J. Wysocki wrote:
> > > [Besides, the current hibernation userland interface is used by default 
by
> > > openSUSE and it's also used by quite some Debian users, so we can't drop
> > > it overnight and it can't be implemented in a compatible way on top of 
the
> > > kexec-based solution.]
> > 
> > Could it be fudged by giving userland a null image and having (say) the 
first 
> > ioctl be one that triggers all the real work (with other ioctls being 
noops 
> > or such like, as appropriate)?
> 
> Well, the "suspend" part is probably doable, but I'm afraid of the "resume"
> one.

'k. I've occasionally thought about trying it, but haven't ever gotten around 
to actually doing it yet. (I'd like to make TuxOnIce transparently replace 
both swsusp and uswsusp if I could).

Regards,

Nigel
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