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

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Message-Id: <1183871941.3388.286.camel@localhost.localdomain>
Date:	Sun, 08 Jul 2007 15:19:01 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>, "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


> I think it's a fairly significant change from the current freezer and I
> also think it's a very good idea. The more I think about it, the more I
> like it, in the sense that it's a simple drop-in that you could put in a
> lot of the ioctl path of drivers to just block tasks that are trying to
> call in while suspending, and could be used selectively by things like
> the USB hub threads.

Note that we could have also a per-device "icebox" (just a waitqueue).
Might be nice for a device to resume whatever it froze just after it
resumed itself, might even be necessary in case whatever thread got
frozen is necessary for handling child devices.

Cheers,
Ben.


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