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

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Date:	Thu, 30 Oct 2014 14:57:22 +0100
From:	Bastien Nocera <hadess@...ess.net>
To:	Pavel Machek <pavel@....cz>
Cc:	John Stultz <john.stultz@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: suspend to partition Re: A desktop environment[1] kernel
 wishlist

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.

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