Re: Back to the future.

From: Rafael J. Wysocki
Date: Sat Apr 28 2007 - 15:11:08 EST

On Saturday, 28 April 2007 20:32, David Lang wrote:
> On Sat, 28 Apr 2007, Pavel Machek wrote:
> >>
> >> We freeze user space processes for the reasons that you have quoted above.
> >>
> >> Why we freeze kernel threads in there too is a good question, but not for me to
> >> answer. I don't know. Pavel should know, I think.
> >
> > We do not want kernel threads running:
> >
> > a) they may hold some locks and deadlock suspend
> >
> > b) they may do some writes to disk, leading to corruption
> >
> > We could solve a) by carefully auditing suspend lock usage to make
> > sure deadlocks are impossible even with kernel threads running.
> remember that we are doing suspend-to-disk, after we do the snapshot we will be
> doing a shutdown. that should simplify the locking issues

That's assuming that we won't need to cancel the hibernation.

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