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

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Message-ID: <Pine.LNX.4.44L0.0707031553020.7671-100000@iolanthe.rowland.org>
Date:	Tue, 3 Jul 2007 15:54:55 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matthew Garrett <mjg59@...f.ucam.org>
cc:	linux-kernel@...r.kernel.org, <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM
 pathway

On Tue, 3 Jul 2007, Matthew Garrett wrote:

> > I agree that in general the suspend process should not have to wait for 
> > a userspace callback to complete.  Indeed, there's no particular 
> > reason that anything running during STR should have to wait for 
> > something in userspace to complete.  Given that fact, I don't see 
> > anything wrong with freezing userspace when doing STR.
> 
> There's nothing wrong with it as such, it's just that our implementation 
> appears to suck in a myriad of small ways that keep cropping up and 
> biting people. Even without the sys_sync(), freezing processes results 
> in the suspend failing because syslog is stuck in D state and won't go 
> into the refrigerator.

Okay, I can believe that.  The proper response then is to fix the 
freezer, not eliminate it.  Has the syslog problem been reported on 
linux-pm?  I don't recall hearing of it before.

Alan Stern

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