[PATCH 0/5] drm/fb-helper: Remove damage worker

[Thomas Zimmermann]

The fbdev emulation runs a separate worker that collects all changes
to the framebuffer and runs DRM damage handling. But this can also be
performed by the worker of fbdev's deferred-I/O code. Move damage
handling there, remove the damage worker and reduce the latency.

I ran a simple benchmark with mplayer and Big Buck Bunny [1] on the
console to look for any changes to performance.

  mplayer -nosound -vo fbdev -benchmark big_buck_bunny_1080p_surround.avi

On my test system (i7-4790, simpledrm, 1024x768), this command always
takes around 95 seconds (57% VC, 36% VO, 7% sys). The difference in
internal scheduling appears to have no impact on performance.

[1] https://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_1080p_surround.avi

Thomas Zimmermann (5):
  drm/fb-helper: Set damage-clip area in helper
  drm/fb-helper: Move dirty-fb update into helper function
  drm/fb-helper: Perform damage handling in deferred-I/O helper
  drm/fb-helper: Schedule deferred-I/O worker after writing to
    framebuffer
  drm/fb-helper: Remove damage worker

 drivers/gpu/drm/drm_fb_helper.c     | 116 +++++++++++++++++++---------
 drivers/video/fbdev/core/fb_defio.c |  16 ++++
 include/drm/drm_fb_helper.h         |   2 -
 include/linux/fb.h                  |   1 +
 4 files changed, 95 insertions(+), 40 deletions(-)


base-commit: 3aa97a74d622aa26fe79cf4bd819b6a4fd176e90
-- 
2.38.0