linux-kernel - Re: [linux-pm] [PATCH -mm 2/2] kexec jump -v11: save/restore device state

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Date:	Fri, 13 Jun 2008 14:05:55 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH -mm 2/2] kexec jump -v11: save/restore
	device state

On Wed, Jun 11, 2008 at 09:01:14AM +0800, Huang, Ying wrote:
> On Tue, 2008-06-10 at 14:01 -0400, Len Brown wrote:
> > 
> > On Tue, 10 Jun 2008, Huang, Ying wrote:
> > 
> > > This patch implements devices state save/restore before after kexec.
> > > 
> > > 
> > > This patch together with features in kexec_jump patch can be used for
> > > following:
> > > 
> > > - A simple hibernation implementation without ACPI support. You can
> > >   kexec a hibernating kernel, save the memory image of original system
> > >   and shutdown the system. When resuming, you restore the memory image
> > >   of original system via ordinary kexec load then jump back.
> > 
> > What part of ACPI's role in hibernation are you trying to avoid
> > 1. enabling wake devices
> > 2. removing power from the system
> > 3. something else?
> 
> ACPI S5 is used instead of S4 for this simple hibernation
> implementation. That is, before creating the hibernation image, the ACPI
> _PTS is not executed, devices are not put into low power state and wake
> devices are not enabled. After creating the hibernation image, the image
> is saved to disk and system is shutdown (go to S5). When resuming from
> hibernated image, ACPI _BFS and _WAK are not executed too.

Hi huang,

Can't we implement ACPI S5 state as an option in current hibernation
framework? Or kexec jump is a requirement for that? 

Thanks
Vivek
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