[PATCH v3 0/5] fbdev: Improve performance of fbdev console

[Thomas Zimmermann]

Hi,

merged with fixes for the typoes in the final patch. Thanks for reviewing.

Best regards
Thomas

Am 23.02.22 um 20:37 schrieb Thomas Zimmermann:
> Optimize performance of the fbdev console for the common case of
> software-based clearing and image blitting.
> 
> The commit descripton of each patch contains resuls os a simple
> microbenchmark. I also tested the full patchset's effect on the
> console output by printing directory listings (i7-4790, FullHD,
> simpledrm, kernel with debugging).
> 
>    > time find /usr/share/doc -type f
> 
> In the unoptimized case:
> 
>    real    0m6.173s
>    user    0m0.044s
>    sys     0m6.107s
> 
> With optimizations applied:
> 
>    real    0m4.754s
>    user    0m0.044s
>    sys     0m4.698s
> 
> In the optimized case, printing the directory listing is ~25% faster
> than before.
> 
> In v2 of the patchset, after implementing Sam's suggestion to update
> cfb_imageblit() as well, it turns out that the compiled code in
> sys_imageblit() is still significantly slower than the CFB version. A
> fix is probably a larger task and would include architecture-specific
> changes. A new TODO item suggests to investigate the performance of the
> various helpers and format-conversion functions in DRM and fbdev.
> 
> v3:
> 	* fix description of cfb_imageblit() patch (Pekka)
> v2:
> 	* improve readability for sys_imageblit() (Gerd, Sam)
> 	* new TODO item for further optimization
> 
> Thomas Zimmermann (5):
>    fbdev: Improve performance of sys_fillrect()
>    fbdev: Improve performance of sys_imageblit()
>    fbdev: Remove trailing whitespaces from cfbimgblt.c
>    fbdev: Improve performance of cfb_imageblit()
>    drm: Add TODO item for optimizing format helpers
> 
>   Documentation/gpu/todo.rst             |  22 +++++
>   drivers/video/fbdev/core/cfbimgblt.c   | 107 ++++++++++++++++---------
>   drivers/video/fbdev/core/sysfillrect.c |  16 +---
>   drivers/video/fbdev/core/sysimgblt.c   |  49 ++++++++---
>   4 files changed, 133 insertions(+), 61 deletions(-)
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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