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

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Date:	Mon, 09 Jul 2007 20:05:22 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	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 Mon, 2007-07-09 at 12:02 +0200, Pavel Machek wrote:
> Hi!
> 
> > > > But I'm not sure it's a good idea in the long run.  Think of a printer 
> > > > daemon, for example.  It shouldn't have to experience unexpected I/O 
> > > > problems merely because someone has decided to put the system to sleep.
> > > 
> > > Why not ? Printer is offline when machine is asleep... trying to print
> 
> ...filesystems are offline, too, when the machine is asleep. Yet,
> unmounting everything on suspend would not result in useful suspend
> support.
> 
> Yes, I believe we should be transparent.

You just compared apple and oranges... Try printing and half way through
the page, suspend your USB bus, and see how the printer reacts.

Ben.


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