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

[Oliver Neukum]

Am Freitag, 6. Juli 2007 schrieb Benjamin Herrenschmidt:
> > Yes, fuse could handle being frozen there. ÂHowever that would only
> > solve part of the problem: an operation waiting for a reply could be
> > holding a VFS mutex and some other task may be blocked on that mutex.
> > 
> > How would you solve freezing those tasks?
> 
> That task is implicitely frozen... but the kernel doesn't know it and
> thus the freezer timeouts or fails or deadlocks or whatever.
> 
> The freezer could be made to ignore tasks that are sleeping in the
> kernel assuming that if they go out of it, they'll ultimately reach
> do_signal and freeze, but that means they can potentially still issues
> IOs which is what the freezer tries to avoid ...
> 
> Or the kernel could start tracking dependencies, but then, good luck
> implementing that crap.

Do we need dependencies? Don't we know that fuse can deadlock only
on a limited number of locks in VFS?

	Regards
		Oliver

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/