Re: Re: [PATCH] Remove process freezer from suspend to RAM pathway

Oliver Neukum
2007-07-05T06:58:03Z

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