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

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Date:	Sun, 8 Jul 2007 16:22:19 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway

On Sun, 8 Jul 2007, Rafael J. Wysocki wrote:

> I'm all for changing this infrastructure, but in an organized way (ie. we
> discuss what to do next, we do that and then we go to the next step) and in
> the order that everyone will be comfortable with.
> 
> So, let's finish this thread and start over from discussing what needs to be
> done, how (ie. in what order etc.) we are going to do that and who is going to
> do what.  Shall we?

IMO we should start by using the new notifier chain and by implementing 
a central "icebox" routine.  Then we can forbid device registration 
during suspend.

It might also be a good idea to add a freezable keventd-like workqueue 
specifically intended for things that need to block during a suspend.  
Although maybe this will end up being unnecessary; it's too soon to 
tell.

Alan Stern

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