[Intel-gfx] [PATCH 0/2] semaphorify the pageflip BO (if possible)

[Ben Widawsky]

I've not observed any FPS changes with my limited testing.

Here is the performance data I collected with nexuiz, measuring the
latency of i915_gem_object_pin_to_display_plane. Top is before, bottom
is after.

    N           Min           Max        Median           Avg        Stddev
x 2246         0.352        37.538         2.791     3.3091901     1.8631844
+ 2239         0.281        44.517         2.699      3.088992      1.583838
Difference at 95.0% confidence
	-0.220198 +/- 0.101227
	-6.65414% +/- 3.05896%
	(Student's t, pooled s = 1.72938)


Ben Widawsky (2):
  drm/i915: extract ring sync code
  drm/i915: use semaphores for the display plane

 drivers/gpu/drm/i915/i915_drv.h            |   19 +++++++++
 drivers/gpu/drm/i915/i915_gem.c            |   51 ++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   60 +---------------------------
 3 files changed, 66 insertions(+), 64 deletions(-)

-- 
1.7.9.4