linux-kernel - Re: [PATCH] kexec based hibernation: a prototype of kexec multi-stage load

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Message-ID: <20080516115833.GB22264@elf.ucw.cz>
Date:	Fri, 16 May 2008 13:58:33 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH] kexec based hibernation: a prototype of kexec
	multi-stage load

Hi!

> > During loading, a hash table mapped from destination page to source
> > page is used instead of original linear mapping
> > implementation. Because the hibernated image may be very large (up to
> > near the size of physical memory), it is very time-consuming to search
> > a source page given the destination page, which is used to check
> > whether an newly allocated page is in the range of allocated
> > destination pages.
> 
> This seems to be an optimization of kexec so that it becomes efficient
> in loading large images (containing large number of segments). Probably
> this can be a separate patch.
> 
> IMHO, we can just first write a minimal patch where one can just switch
> between kernels. Once that patch is upstream, we can enhance

Yes, please.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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