[Nouveau] [Patch] Yet another version of the card pausing patch

[Martin Peres]

Hi everyone,

I would like devs to test this patch on all their cards(<nvc0) and 
report bugs/instability. It shouldn't ever crash (but it may not always 
work and return -EAGAIN).

I've attached a little bash script that you need to modify according to 
the available perf levels. Please launch it and play, watch videos or 
browse the internet.

Also, if you could look at the hold_spin variable and tell me how you 
would deal with that, it would be kind of you. The problem is that 
PGRAPH may take an awful lot
of time to pause in certain conditions and holding the lock at this 
position isn't needed (as far as I can tell, the critical ressource is 
fifo_reassign).

Martin

PS: I'll be out in an hour for a week so I may be slower to answer messages.