TTM vs GEM discussion questions

[Thomas H. <th...@tu...>]

Hi.

I have a couple of question w r t the TTM vs GEM discussion:

1) How does pwrite() avoid clflush()es or wbinvd()s in the i915 gem case?

2) Some people have stated that GPU page faults could not be implemented 
with TTM.
We've certainly dealt with that type of hardware, but found no obvious 
reason to use that feature.

Could someone tell me why this feature can't be used with TTM (or is it 
that it can't be used with the current TTM driver interface?)  and also 
a typical use-case where it might be beneficial within either the GEM or 
TTM context?

/Thomas