[Intel-gfx] [PATCH] intel: Leak the userptr test bo

[Tvrtko Ursulin]

On 04/14/2015 05:31 PM, Chris Wilson wrote:
> In order to use userptr, the kernel tracks the owner's mm with a
> mmu_notifier. Setting that is very expensive - it involves taking all
> mm_locks and a stop_machine(). This tracking lives only for as long as
> the client is using userptr objects - so if the client allocates then
> frees a userptr in a loop, we will be executing that heavyweight setup
> everytime. To ammoritize this cost, just leak the test bo and the single

Spellcheck on this line.

Also, if drm_intel_bufmgr_destroy is what I think it is, I think for 
correctness we would need to release that stuff there. What do you 
think? I could respin it with that if you are too busy?

Regards,

Tvrtko