drm/i915: Include bound and active pages in the count of shrinkable objects
When the machine is under a lot of memory pressure and being stressed by multiple GPU threads, we quite often report fewer than shrinker->batch (i.e. SHRINK_BATCH) pages to be freed. This causes the shrink_control to skip calling into i915.ko to release pages, despite the GPU holding onto most of the physical pages in its active lists. References: https://bugs.freedesktop.org/show_bug.cgi?id=72742Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NRobert Beckett <robert.beckett@intel.com> Reviewed-by: NRafael Barbalho <rafael.barbalho@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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