[v2,0/2] fbdev: Significantly improve performance of fbdefio mmap

Message

Thomas Zimmermann Feb. 11, 2022, 9:46 a.m. UTC

Remove the bubble sort from fbdev defered-I/O page tracking. Most
drivers only want to know which pages have been written to. The exact
order is not important.

Tested on simpledrm.

v2:
	* make sorted page lists the special case (Sam)
	* improve several comments (Sam)

Thomas Zimmermann (2):
  fbdev/defio: Early-out if page is already enlisted
  fbdev: Don't sorting deferred-I/O pages by default

 drivers/staging/fbtft/fbtft-core.c  |  1 +
 drivers/video/fbdev/broadsheetfb.c  |  1 +
 drivers/video/fbdev/core/fb_defio.c | 48 ++++++++++++++++++++---------
 drivers/video/fbdev/metronomefb.c   |  1 +
 drivers/video/fbdev/udlfb.c         |  1 +
 include/linux/fb.h                  |  1 +
 6 files changed, 38 insertions(+), 15 deletions(-)