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

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Message-ID: <20080711202434.GB6261@elf.ucw.cz>
Date:	Fri, 11 Jul 2008 22:24:35 +0200
From:	Pavel Machek <pavel@...e.cz>
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>,
	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 Fri 2008-07-11 12:21:31, Andrew Morton 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?

Well, it will be tricky to get kjump-hibernation right with respect to
ACPI, but we should be fairly close to basic hibernation working with
this. It has major advantage of not needing refrigerator (and few
disadvantages -- like doing aditional boot during suspend).

But main reason I'd like kjump to be in is different -- it should be
useful to stuff like "dump but continue running", etc...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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