Thomas Zimmermann 7dbc515f5c fbdev: Improve performance of sys_fillrect() ... Improve the performance of sys_fillrect() by using word-aligned 32/64-bit mov instructions. While the code tried to implement this, the compiler failed to create fast instructions. The resulting binary instructions were even slower than cfb_fillrect(), which uses the same algorithm, but operates on I/O memory. A microbenchmark measures the average number of CPU cycles for sys_fillrect() after a stabilizing period of a few minutes (i7-4790, FullHD, simpledrm, kernel with debugging). The value for CFB is given as a reference. sys_fillrect(), new: 26586 cycles sys_fillrect(), old: 166603 cycles cfb_fillrect(): 41012 cycles In the optimized case, sys_fillrect() is now ~6x faster than before and ~1.5x faster than the CFB implementation. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220223193804.18636-2-tzimmermann@suse.de		2022-03-02 20:20:34 +01:00
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backlight	backlight: qcom-wled: Respect enabled-strings in set_brightness	2021-12-22 11:18:46 +00:00
console	Linux 5.16-rc5	2021-12-14 10:24:28 +01:00
fbdev	fbdev: Improve performance of sys_fillrect()	2022-03-02 20:20:34 +01:00
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