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When we evict from the GTT to make room for an object, the hole we create is put onto the MRU stack inside the drm_mm range manager. On the next search pass, we can speed up a PIN_HIGH allocation by referencing that stack for the new hole. v2: Pull together the 3 identical implements (ahem, a couple were outdated) into a common routine for allocating a node and evicting as necessary. v3: Detect invalid calls to i915_gem_gtt_insert() v4: kerneldoc Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170111112312.31493-1-chris@chris-wilson.co.uk