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

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Date:	Fri, 13 Jun 2008 09:18:52 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"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-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH -mm 2/2] kexec jump -v11: save/restore device state

On Thu, 2008-06-12 at 09:02 -0400, Vivek Goyal wrote:
[...]
> Few things I don't understand.
> 
> - Are you saying that hibernated image will be saved in initrd
>   (rootfs.gz)? But that saving is only in RAM, we never write back
>   it to disk?

No. Hibernated image should be saved in a dedicated raw partition as you
said below.

> - I thought we probably have to dedicate a raw partition kind of thing
>   for saving image and then modify boot loader command line to something
>   similar to, "resume=partition". Then initrd can go hunting for image
>   in respective partition (as specified by command line parameter) and if
>   image is not available then continue with normal boot.

Yes. But the boot-loader command line only need to be changed during
system install or hibernation setup. We need not change the location of
"hibernation partition" frequently.

So I think one boot-loader command line is sufficient for:

- normal boot
- normal boot a system to be hibernated
- boot helper system to restore the hibernated system

Best Regards,
Huang Ying

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