573adb3962
We are motivated to avoid using a bitfield for obj->active for a couple of reasons. Firstly, we wish to document our lockless read of obj->active using READ_ONCE inside i915_gem_busy_ioctl() and that requires an integral type (i.e. not a bitfield). Secondly, gcc produces abysmal code when presented with a bitfield and that shows up high on the profiles of request tracking (mainly due to excess memory traffic as it converts the bitfield to a register and back and generates frequent AGI in the process). v2: BIT, break up a long line in compute the other engines, new paint for i915_gem_object_is_active (now i915_gem_object_get_active). 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/1470324762-2545-23-git-send-email-chris@chris-wilson.co.uk |
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| ipu-v3 | ||
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