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SubjectRe: Hibernation considerations
On Tue, 17 Jul 2007 david@lang.hm wrote:

> > But what about the freezer? The original reason for using kexec was to
> > avoid the need for the freezer. With no freezer, while the original
> > kernel is busy powering down its devices, user tasks will be free to
> > carry out I/O -- which will make the memory snapshot inconsistent with
> > the on-disk data structures.
>
> no, user tasks just don't get scheduled during shutdown.

But a user task may be holding a lock which is needed for putting some
device into low-power mode. It can't release that lock if it doesn't
get scheduled.

Alan Stern

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