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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Message-Id: <200707051704.48137.rjw@sisk.pl>
Date:	Thu, 5 Jul 2007 17:04:47 +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 16:39, Matthew Garrett wrote:
> On Thu, Jul 05, 2007 at 04:41:39PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, 5 July 2007 16:26, Matthew Garrett wrote:
> > > On Thu, Jul 05, 2007 at 04:28:11PM +0200, Rafael J. Wysocki wrote:
> > > > On Thursday, 5 July 2007 15:57, Matthew Garrett wrote:
> > > > > And also "Userland should not depend on userland services", which is 
> > > > > rather more of a problem.
> > > > 
> > > > I think you're oversimplifying it, as far as FUSE is concerned.
> > > > 
> > > > Namely, if there are two userland tasks, A and B, and B is uninterruptible,
> > > > because A is blocked, then this is not a usual situation.
> > > 
> > > Fuse is one case of it occuring, and if we end up with more userspace 
> > > drivers then the problem is only going to get worse.
> > 
> > But this is a problem by itself, regardless of the freezer etc., no?
> 
> 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.

Greetings,
Rafael


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