linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Date:	Thu, 5 Jul 2007 07:46:01 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Matthew Garrett" <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Oliver Neukum" <oliver@...kum.org>,
	"Miklos Szeredi" <miklos@...redi.hu>, paulus@...ba.org,
	stern@...land.harvard.edu, johannes@...solutions.net,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	pavel@....cz, benh@...nel.crashing.org
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

On 7/5/07, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Thu, Jul 05, 2007 at 04:09:24PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, 5 July 2007 15:46, Matthew Garrett wrote:
> > > I have a model for STD that avoids the need to freeze the entirity of
> > > userspace, but I need to find some more time to flesh it out.
> >
> > You can just describe it, as far as I'm concerned. :-)
>
> The basic model is that nobody's really described a use-case where we
> actually care about restoring system state. What people want is to be
> able to restore application state.

Hmm, careful. There are a bunch of people who use suspend2 exactly
because it saves and restores the page cache, leaving the system in a
usable state without waiting for the universe to swap back in from
disk. It makes a big difference on older laptops with slow drives.
While the other advantages you list for process cryogenics are pretty
neat, let's remember that the 99% use case for STD is laptops.
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