[Intel-gfx] [RFC 00/38] PPGTT dynamic page allocations

[Chris Wilson]

On Wed, Nov 05, 2014 at 09:50:47AM +0000, Chris Wilson wrote:
> Hmm, for pageflips it is not that useful unless you give me a method to
> pre-bind it elsewhere. Currently, I force a pagefault on objects that
> are allocated for use as scanout so that we do not incur the stall when
> flipping. Even secondary planes we often use direct access for uploads
> and so will also want a ggtt binding before flipping. (If they were
> linear, or we used accessors everywhere, we could just ignore the
> fence and GGTT for direct access... But that gets complicated and slow
> for anything other than simple transfers.)

Actually using a separate vma for pageflips would not be that expensive
(i.e. no object stall) if you took my vma centric requests patch...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre