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

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Message-Id: <20080711122131.b6461ab1.akpm@linux-foundation.org>
Date:	Fri, 11 Jul 2008 12:21:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	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 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?

What are the prospects of supporting other architectures?

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

Thanks.
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