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Date:	Thu, 5 Jul 2007 08:58:03 +0200
From:	Oliver Neukum <>
To:	Paul Mackerras <>
Cc:	Alan Stern <>,
	Johannes Berg <>,
	"Rafael J. Wysocki" <>,
	Linux-pm mailing list <>,
	Kernel development list <>,
	Pavel Machek <>,
	Matthew Garrett <>,
	Benjamin Herrenschmidt <>
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?


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