[Intel-gfx] [PATCH 06/15] drm/i915/gem: Free pages before rcu-freeing the object

[Matthew Auld]

On 03/07/2019 10:17, Chris Wilson wrote:
> As we have dropped the final reference to the object, we do not need to
> wait until after the rcu grace period to drop its pages. We still require
> struct_mutex to completely unbind the object to release the pages, so we
> still need a free-worker to manage that from process context. By
> scheduling the release of pages before waiting for the rcu should mean
> that we are not trapping those pages from beyond the reach of the
> shrinker.
> 
> v2: Pass along the request to skip if the vma is busy to the underlying
> unbind routine, to avoid checking the reservation underneath the
> i915->mm.obj_lock which may be used from inside irq context.
> 
> v3: Flip the bit for unbinding while active, for later convenience.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111035
> Fixes: a93615f900bd ("drm/i915: Throw away the active object retirement complexity")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>