Re: suspend to partition Re: A desktop environment[1] kernel wishlist

Bastien Nocera
2014-10-30T13:58:10Z

On Tue, 2014-10-28 at 19:50 +0100, Pavel Machek wrote:
> Hi!
>
> > > > > For mobile
> > > > > devices this is an expected design point, but for off-the-shelf
> > > > > laptops with big fans and exhaust vents, I'm not sure how safe this
> > > > > would be, so you may need to constrain this functionality somehow (or
> > > > > look to see if a enforced low-power resume is possible).
> > > >
> > > > I think that we won't know whether it's a problem until the point that
> > > > somebody actually implements it.
> > >
> > > Kernel does not stop you at this point, right?
> > >
> > > Suspend-to-partition is also doable today (see suspend.sf.net),
> >
> > Is it perfect? Because no releases in 3 years kind of scares me.
>
> Yes, it is perfect :-).
>
> [It is in use by SUSE, so it should be good; and if anything, it shows
> that suspend-to-partition does not need kernel help.]

Does SUSE have patches to integrate this functionality into systemd, by
any chance?

> > > or you
> > > can just swapon before starting. You can take it off the list, I
> > > believe.
> >
> > Or we could create a new filesystem type that isn't swap, that isn't
> > used by swap at all, but could be created by distributions' installers.
> > Then I wouldn't need to hope that the swap didn't start being used in
> > between me enabling it, and the suspend actually occurring (making it
> > impossible to disable afterwards).
>
> I see there's a race, but is it big enough to matter in practice? I
> don't think so.

I'd certainly prefer not to chance it...

> Anyway -- suspend.sf.net is way to go for advanced
> features.

Noted, thanks.