Quoting Tvrtko Ursulin (2019-04-02 17:09:18)
> 
> On 25/03/2019 09:03, Chris Wilson wrote:
> > @@ -2120,20 +2150,20 @@ eb_select_engine(struct drm_i915_private *dev_priv,
> >               } else {
> >                       DRM_DEBUG("execbuf with unknown bsd ring: %u\n",
> >                                 bsd_idx);
> > -                     return NULL;
> > +                     return -EINVAL;
> >               }
> >   
> > -             engine = dev_priv->engine[_VCS(bsd_idx)];
> > +             engine = eb->i915->engine[_VCS(bsd_idx)];
> >       } else {
> > -             engine = dev_priv->engine[user_ring_map[user_ring_id]];
> > +             engine = eb->i915->engine[user_ring_map[user_ring_id]];
> 
> Cache dev_priv/i915 in a local?

i915_gem_do_execbuffer                      4742    4740      -2

Barely seems worth it this time.
-Chris
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