drm/i915: Allocate active tracking nodes from a slabcache
Wrap the active tracking for a GPU references in a slabcache for faster allocations, and hopefully better fragmentation reduction. v3: Nothing device specific left, it's just a slabcache that we can make global. v4: Include i915_active.h and don't put the initfunc under DEBUG_GEM Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190205130005.2807-4-chris@chris-wilson.co.uk
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