drm: Compute tight evictions for drm_mm_scan
Compute the minimal required hole during scan and only evict those nodes that overlap. This enables us to reduce the number of nodes we need to evict to the bare minimum. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-31-chris@chris-wilson.co.uk
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