[Intel-gfx] [PATCH 43/49] drm/i915: Do not zero initialise page tables

[Chris Wilson]

On Tue, Apr 07, 2015 at 05:46:19PM +0300, Mika Kuoppala wrote:
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > After we successfully allocate them, we will fill them with their
> > initial contents (either the chain of page tables, or a pointer to the
> > scratch page).
> >
> > Regression from
> > commit 06fda602dbca9c59d87db7da71192e4b54c9f5ff
> > Author: Ben Widawsky <benjamin.widawsky at intel.com>
> > Date:   Tue Feb 24 16:22:36 2015 +0000
> >
> >     drm/i915: Create page table allocators
> >
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Michel Thierry <michel.thierry at intel.com> (v3+)
> > Cc: Mika Kuoppala <mika.kuoppala at intel.com>
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > ---
> 
> The gen8 parts of dynamic page table series, which Michel will resend
> in near future, address this by not zero filling but pointing
> unused page directory entries to scratch page table.

However, it is currently a regression.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre