On Thu, Apr 24, 2014 at 02:22:39AM -0700, Chris Wilson wrote:
> On Fri, Mar 28, 2014 at 03:58:25PM -0700, Volkin, Bradley D wrote:
> > On Mon, Mar 17, 2014 at 05:21:55AM -0700, Chris Wilson wrote:
> > > @@ -1949,58 +1956,58 @@ static unsigned long
> > > __i915_gem_shrink(struct drm_i915_private *dev_priv, long target,
> > > bool purgeable_only)
> > > {
> > > - struct list_head still_bound_list;
> > > - struct drm_i915_gem_object *obj, *next;
> > > + struct list_head still_in_list;
> > > + struct drm_i915_gem_object *obj;
> > > unsigned long count = 0;
> > >
> > > - list_for_each_entry_safe(obj, next,
> > > - &dev_priv->mm.unbound_list,
> > > - global_list) {
> > > - if ((i915_gem_object_is_purgeable(obj) || !purgeable_only) &&
> > > - i915_gem_object_put_pages(obj) == 0) {
> > > - count += obj->base.size >> PAGE_SHIFT;
> > > - if (count >= target)
> > > - return count;
> > > - }
> > > - }
> > > -
> > > /*
> > > - * As we may completely rewrite the bound list whilst unbinding
> > > + * As we may completely rewrite the (un)bound list whilst unbinding
> > > * (due to retiring requests) we have to strictly process only
> > > * one element of the list at the time, and recheck the list
> > > * on every iteration.
> >
> > Is it still true that we could retire requests on this path? I see that
> > currently we will retire requests via:
> > i915_vma_unbind -> i915_gem_object_finish_gpu ->
> > i915_gem_object_wait_rendering.
> >
> > But we've taken the explicit request retirement out of the wait_rendering
> > path.
> > Have I missed somewhere that it could still happen?
>
> Yes, as wait_rendering doesn't retire all the requests, we may still have
> a request associated with the bo. This will then cause us to call
> i915_gem_object_retire() during i915_gem_object_put_pages() (through
> i915_gem_object_set_to_cpu_domain) thereby discard the last active
> reference and destroying the object unless we take care.
Ok, I see it now. Thanks. This one is
Reviewed-by: Brad Volkin <bradley.d.vol...@intel.com>
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
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