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

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Message-ID: <20070921094512.GA20149@elf.ucw.cz>
Date:	Fri, 21 Sep 2007 11:45:12 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	nigel@...pend2.net, "Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

Hi!
> >
> > Sounds doable, as long as you can cope with long command lines (which 
> > shouldn't be a biggie). (If you've got a swapfile or parts of a swap 
> > partition already in use, it can be quite fragmented).
> 
> Hmm.  This is an interesting problem.  Sharing a swap file or a swap
> partition with the actual swap of user space pages does seem to be
> a limitation of this approach.
> 
> Although the fact that it is simple to write to a separate file may
> be a reasonable compensation.

I'm not sure how you'd write it to a separate file. Notice that kjump
kernel may not mount journalling filesystems, not even
read-only. (Ext3 replays journal in that case). You could pass block
numbers from the original kernel...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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