linux-kernel - Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

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Message-Id: <200707131401.35274.rjw@sisk.pl>
Date:	Fri, 13 Jul 2007 14:01:34 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	david@...g.hm, Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

On Friday, 13 July 2007 19:32, Huang, Ying wrote:
> On Thu, 2007-07-12 at 20:06 -0700, david@...g.hm wrote:
> > >> I agree, a stipped down hibernate kernel can be very small, not allocating
> > >> this memory until it's needed is a step for the final polishing.
> > >
> > > I'm not sure if I agree with that.  In any case, having to use two different
> > > kernels for hibernation would be a big drawback.
> > 
> > I see it as a big advantage to not have to use the main kernel for the 
> > suspend. please keep it as an option at least.
> 
> Yes. It has additional bonus to make it possible to write/read image
> from a program other than main kernel. For example, for a specific
> mobile device product (Such as Intel MID), a customized ultra-small
> program (or kernel) can be composed to write/read image. That way, the
> hibernate/resume time can be reduced to minimal.

You don't need kexec for that.  This is how the userland hibernation (aka
uswsusp) works.

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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