linux-kernel - Re: [linux-pm] [RFC][PATCH 0/2 -mm] kexec based hibernation -v3

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Message-Id: <1190364431.21818.186.camel@caritas-dev.intel.com>
Date:	Fri, 21 Sep 2007 16:47:11 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Stefan Rompf <stefan@...lof.de>
Cc:	linux-pm@...ts.linux-foundation.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [RFC][PATCH 0/2 -mm] kexec based hibernation -v3

On Fri, 2007-09-21 at 10:43 +0200, Stefan Rompf wrote:
> Am Donnerstag, 20. September 2007 07:34 schrieb Huang, Ying:
> 
> > The hibernation procedure with the patch set is as follow:
> >
> > 1. Boot a kernel A
> >
> > 2. Work under kernel A
> >
> > 3. Kexec another kernel B (crash dump enabled) in kernel A.
> 
> From a short glance over current Linus' arch/i386/kernel/machine_kexec.c, 
> memory for the crash dump kernel B still needs to be reserved statically when 
> booting A.
> 
> This is one of the biggest issues with kexec based hibernation. For the 
> typical notebook user, it is totally unacceptable to reserve 16 megabytes of 
> memory just to be able to suspend to disk. And given the fact that current 
> distribution kernels are quite modular and require early module loading, even 
> more memory might be needed.
> 
> IMHO, a plan how to fix this must exist or the concept of kexec based 
> hibernation is a waste of time.

This issue has been resolved. The implementation method details in
another mail with title as follow:

[RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

Best Regards,
Huang Ying
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