Re: [linux-pm] Re: Hibernation considerations

Hi!

The problem with FUSE is related to the fact that the freezer can't
freeze uninterruptible tasks and we said that perhaps we might avoid
it if FUSE was made freezing-aware. Still, no one has gone in this
direction and I don't know of any plans to do that.

I thought we have fully explored this direction. Lots of emails, and
an IRC session with Pavel. Conclusion:

What am I missing in the following suggested solution?

1) In the freezer code, we implement a new TIF_LATEFREEZE process flag, which,
when set, causes a userspace process to be frozen with kernel threads
instead of with userspace ones. When freezing, we freezing !TIF_LATEFREEZE,
sync and then freeze TIF_LATEFREEZE and freezable kernel threads.

2) In the fuse code, the PID of the process that will do the work gets passed

The list of neccessary PIDs is not known to the kernel. FUSE servers
may depend on another parts of userland.



--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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