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

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Message-Id: <200707050858.03638.oliver@neukum.org>
Date:	Thu, 5 Jul 2007 08:58:03 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Johannes Berg <johannes@...solutions.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

Am Donnerstag, 5. Juli 2007 schrieb Paul Mackerras:
> > I have discussed the benefits elsewhere.  As for the deadlocks -- do 
> > you still observe them if you use the version of the freezer which 
> > doesn't freeze kernel threads?
> 
> In general the only way to guarantee there are no deadlocks is to
> construct the graph of dependencies between tasks.  Those dependencies
> are not in practice observable from outside the tasks, so it is
> virtually impossible to construct the graph.

In which way can user space tasks depend on each other in a way that
allows a them members of that cycle to be in uninterruptible sleep?

	Regards
		Oliver

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