[Intel-gfx] [PATCH] drm/i915: Prune the reservation shared fence array

[Chris Wilson]

On Tue, Nov 15, 2016 at 04:38:19PM +0200, Joonas Lahtinen wrote:
> On ma, 2016-11-14 at 08:53 +0000, Chris Wilson wrote:
> > +++ b/drivers/gpu/drm/i915/i915_vma.c
> > @@ -53,6 +53,12 @@ i915_vma_retire(struct i915_gem_active *active,
> >  	if (--obj->active_count)
> >  		return;
> >  
> > +	/* Prune the shared fence arrays iff completely idle (inc. external) */
> > +	ww_mutex_lock(&obj->resv->lock, NULL);
> > +	if (reservation_object_test_signaled_rcu(obj->resv, true))
> > +		reservation_object_add_excl_fence(obj->resv, NULL);
> > +	ww_mutex_unlock(&obj->resv->lock);
> > +
> 
> This is not the first instance of "resv->lock" usage, but I think we
> should not be doing that, and add reservation_* functions instead...

But in the short term wrt to how we consume many, many more megabytes
than we used to in gem_ctx_*....
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre