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

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Message-Id: <200709271635.13099.nigel@nigel.suspend2.net>
Date:	Thu, 27 Sep 2007 16:35:10 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	Joseph Fannin <jfannin@...il.com>, Pavel Machek <pavel@....cz>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, nigel@...pend2.net,
	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.

On Thursday 27 September 2007 16:33:54 Huang, Ying wrote:
> On Wed, 2007-09-26 at 16:30 -0400, Joseph Fannin wrote:
> >     But, in my ignorance, I'm not sure even fixing the ext3 bug will
> > guarantee you consistent metadata so that you can handle a
> > swap/hibernate file.  You can do a sync(), but how do you make that
> > not race against running processes without the freezer, or blkdev
> > snapshots?
> > 
> >     I guess uswsusp and the-patch-previously-known-as-suspend2 handle
> > this somehow, though.
> 
> The image-writing kernel of kexec based hibernation run in a controlled
> way. It is not used by normal user, so only really necessary process
> need to be run. For example, it is possible that there is only one user
> process -- the image-writing process running in image-writing kernel.
> So, no freezer or blkdev snapshot is needed.

You're thinking of the wrong kernel - we were talking about prior to switching 
to the kexec'd kernel while suspending.

Regards,

Nigel
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