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

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Message-Id: <1190874834.21818.300.camel@caritas-dev.intel.com>
Date:	Thu, 27 Sep 2007 14:33:54 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Joseph Fannin <jfannin@...il.com>
Cc:	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

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.

Best Regards,
Huang Ying
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