Re: [linux-pm] Is it supposed to be ok to call del_gendisk whileuserspace is frozen?

From: Pavel Machek
Date: Mon Mar 01 2010 - 01:35:34 EST


> > > This is a matter for Jens. Is the bdi writeback task freezable? If it
> > > is, should it be made unfreezable?
> >
> > I'm not a big expect on what tasks should be freezable or not. As it
> > stands, the writeback tasks will attempt to freeze and thaw with the
> > system. I guess that screws the sync from resume call, since it's not
> > running and the sync will wait for it to retrieve and finish that work
> > item.
> >
> > To the suspend experts - can we safely mark the writeback tasks as
> > non-freezable?
> The reason for freezing those tasks is to avoid writebacks at random
> times during a system sleep transition, when the underlying device may
> already be suspended, right?

It is also there to avoid inconsistency between in-filesystem data and
snapshot in hibernation image.

(cesky, pictures)
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