Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: No freezing of kernel threads (was: Re: [GIT PULL] libata fixes for v3.13-rc5) | Date | Fri, 27 Dec 2013 00:23:10 +0100 |
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On Thursday, December 26, 2013 02:01:20 PM Tejun Heo wrote: > Hey, > > On Thu, Dec 26, 2013 at 01:42:29PM -0500, Alan Stern wrote: > > In the case of hibernation, it's not so simple. We do need to perform > > I/O, in order to save the memory image. But we also need to avoid > > unnecessary I/O, in order to keep the on-disk data consistent with the > > data in the memory image. You probably can't accomplish this at the > > device driver or subsystem level. > > That was what I assumed too but Rafael tells me it has nothing to do > with hibernation.
It doesn't prevent on-disk data corruption from happening in case of a failing hibernation. In case of a successful hibernation it is key to keep on-disk data in sync with the contents of the image, but relying on the freezing for that is rather not a winning strategy, so to speak. It would be better to freeze filesystems instead (which has been discussed in another thread recently).
Thanks, Rafael
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