drm/i915: optimise i915_gem_object_map() for small objects
We're using this function for ringbuffers and other "small" objects, so it's worth avoiding an extra malloc()/free() cycle if the page array is small enough to put on the stack. Here we've chosen an arbitrary cutoff of 32 (4k) pages, which is big enough for a ringbuffer (4 pages) or a context image (currently up to 22 pages). v5: change name of local array [Chris Wilson] Signed-off-by: NDave Gordon <david.s.gordon@intel.com> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1463741647-15666-3-git-send-email-chris@chris-wilson.co.uk
Showing
想要评论请 注册 或 登录