linux-kernel - Re: [PATCH -mm 1/2] kexec jump -v12: kexec jump

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Date:	Mon, 14 Jul 2008 21:30:31 +0800
From:	"huang ying" <huang.ying.caritas@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Vivek Goyal" <vgoyal@...hat.com>,
	"Huang Ying" <ying.huang@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Pavel Machek" <pavel@....cz>, nigel@...el.suspend2.net,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org,
	"Kexec Mailing List" <kexec@...ts.infradead.org>
Subject: Re: [PATCH -mm 1/2] kexec jump -v12: kexec jump

On Sat, Jul 12, 2008 at 3:21 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 8 Jul 2008 10:50:51 -0400 Vivek Goyal <vgoyal@...hat.com> wrote:
>
>> On Mon, Jul 07, 2008 at 11:25:22AM +0800, Huang Ying wrote:
>> > This patch provides an enhancement to kexec/kdump. It implements
>> > the following features:
>> >
>> > - Backup/restore memory used by the original kernel before/after
>> >   kexec.
>> >
>> > - Save/restore CPU state before/after kexec.
>> >
>>
>> Hi Huang,
>>
>> In general this patch set looks good enough to live in -mm and
>> get some testing going.
>>
>> To me, adding capability to return back to original kernel looks
>> like a logical extension to kexec functionality.
>
> Exciting ;)  It's much less code than I expected.
>
> I don't think I understand the feature any more.  Once upon a time we
> thought that this might become a new and better (or at least
> better-code-sharing) way of doing suspend-to-disk.  How far are we from
> that?

At least there are still issues as follow:

- We need a mechanism to pass some information (such as backup pages
map) from hibernated kernel to hibernating kernel. Maybe in C calling
convention.
- To load hibernation image via /sbin/kexec, the segment number
constraint of sys_kexec_load needs to be extended (maybe via
multi-stage loading).
- Make kexec based hibernation compatible with ACPI S4.
- Extend makedumpfile utility for kexec based hibernation.

> What are the prospects of supporting other architectures?

I will work on x86_64 supporting.

> Who maintains kexec-tools, and are they OK with merging up the
> corresponding changes?

I will work with kexec-tools mailing list for corresponding kexec-tools patches.

Best Regards,
Huang Ying
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