[Intel-gfx] [PATCH v3 3/8] drm/i915: Add a new "remapped" gtt_view

[Chris Wilson]

Quoting Ville Syrjälä (2018-10-01 16:03:30)
> On Wed, Sep 26, 2018 at 08:50:25AM +0100, Tvrtko Ursulin wrote:
> > 
> > On 25/09/2018 20:37, Ville Syrjala wrote:
> > One more thing, do you really need random access for this 
> > transformation? Or you could walk the sg list as it is? Just if you hit 
> > a too long chunk you need to copy a trimmed version over and know where 
> > to continue for the next row. If doable it would be better than having 
> > to kvmalloc_array.
> 
> I think Chris suggested just using i915_gem_object_get_dma_address()
> here. But I'm not sure why we're not using it for rotate_pages()
> as well.

Tvrtko is opposed to populating the obj->mm.pages cache with no defined
release point. I say the mempressure and shrinker should to the right
thing, but it's a big if.
-Chris