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

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Message-ID: <20080714054644.GC20258@elf.ucw.cz>
Date:	Mon, 14 Jul 2008 07:46:44 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Nigel Cunningham <nigel@...el.suspend2.net>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	Horms <horms@...ge.net.au>
Subject: Re: [PATCH -mm 1/2] kexec jump -v12: kexec jump

On Sat 2008-07-12 11:02:17, Nigel Cunningham wrote:
> Hi.
> 
> On Fri, 2008-07-11 at 16:11 -0400, Vivek Goyal wrote:
> > Hi Andrew,
> > 
> > We can use this patchset for hibernation, but can it be a better way of doing
> > things than what we already have, I don't know. Last time I had raised
> > this question and power people had various views. In the end, Pavel wanted
> > this patchset to be in.  Pavel, can tell more here...
> > 
> > To me this patchset looks interesting for couple of reasons.
> > 
> > - Looks like an interesting feature where one can have a separate kernel
> >   in memory and one can switch between the kernels on the fly. It can
> >   be modified to have more than one kernel in memory at a time.
> 
> I'm not sure how useful that would be, though. I already have
> functionality in TuxOnIce which allows you to resume a different image
> instead of powering off (roughly the same thing when combined with not
> removing the image after resuming). It was neat when testing to be
> able

Beaty of kjump is that it is supposed to used on half-broken system,
so it is useful for debugging.

> > - So far kexec was one directional. One can only kexec to new kernel and
> >   old kernel was gone. Now this patchset makes kexec functionality kind
> >   of bidirectional and this looks like logical extension and can lead
> >   to intersting use cases in future.
> 
> Ah. You mean keeping both kernels in memory at the same time? In the
> above, I was replacing one image with another.

Yep, kjump keeps both kernels loaded at the same time.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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