linux-kernel - Re: removing refrigerator does not help with s2ram vs. fuse deadlocks (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway)

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Date:	Thu, 5 Jul 2007 17:27:35 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Pavel Machek <pavel@....cz>, Paul Mackerras <paulus@...ba.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Johannes Berg <johannes@...solutions.net>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: removing refrigerator does not help with s2ram vs. fuse deadlocks (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway)

On Thursday, 5 July 2007 17:03, Matthew Garrett wrote:
> On Thu, Jul 05, 2007 at 05:04:47PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, 5 July 2007 16:39, Matthew Garrett wrote:
> > > Why?
> > 
> > You have processes that don't react to signals, because some other user land
> > task is misbehaving.  I'd call that ugly at the very least.
> 
> It already happens with, say, NFS. Don't think about it in terms of a 
> userland task misbehaving - think of it in terms of a resource becoming 
> unavailable.

I think there's a difference between a userland task playing the role of a
resource and a "real" external resource the kernel doesn't control.

IMO, userland tasks should not have the power to affect each other as though
they were parts of the kernel.

Greetings,
Rafael
 

-- 
"Premature optimization is the root of all evil." - Donald Knuth
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