linux-kernel - Re: Hibernation Redesign

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Message-Id: <E1I8bEi-0000HF-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 11 Jul 2007 14:24:04 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	nigel@...el.suspend2.net
CC:	miklos@...redi.hu, rjw@...k.pl, a1426z@...ab.com, jeremy@...p.org,
	jbms@....edu, pavel@....cz, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: Hibernation Redesign

> No other _proper_ solutions have been proposed. Everyone who suggests removing 
> the freezer also suggests implementing it all over again. It might be sending 
> SIGSTOP to everything. It might be shifting the desk chairs around and 
> creating a completely new kernel context, but they always have the same 
> goal - stopping the existing activity, and they all come with their own 
> issues (even if they're not obvious yet because the alternatives are 
> currently vapourware to one extent or another).

Hey, I know precious little about drivers and power management, but I
can clarly see, that

 a) stopping all tasks and requiring them to finish any syscall they
 are in

 b) stopping tasks _in the driver_ that are trying to access the
 harware during/after suspend

are completely different solutions, the later being much more fine
grained and not having all of the mentioned problems that the former
exhibits.

> IMHO, the real solution is to go back to the original issue and fix it 
> properly. Make fuse filesystems play nicely with the existing freezer. I've 
> just gone back and looked at the point where you started talking 
> about "malicious filesystems". You talk about fuse imposing certain ordering 
> in the userspace tasks being frozen. Please, say more. What ordering issues? 
> Why? How can such ordering be determined programmatically?

It can't.  If you are interested, please read through that thread.  If
something's still not clear, let's discuss it further.

Miklos
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