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

From: Huang, Ying
Date: Thu Sep 27 2007 - 02:32:09 EST

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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