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| author | Rob Clark <robdclark@chromium.org> | 2023-03-24 15:00:13 -0700 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-04-06 20:29:40 +0300 |
| commit | 4969bccd5f4e9d59e9aca7e873834be9519be013 (patch) | |
| tree | 781754e92bea4d1f441a460bc05830c7aff6c701 /drivers/gpu/drm/msm/msm_io_utils.c | |
| parent | f1af066bcfd38daa9eee7195ef772dadaaa18520 (diff) | |
| download | linux-4969bccd5f4e9d59e9aca7e873834be9519be013.tar.gz linux-4969bccd5f4e9d59e9aca7e873834be9519be013.tar.bz2 linux-4969bccd5f4e9d59e9aca7e873834be9519be013.zip | |
drm/msm: Avoid rounding down to zero jiffies
If userspace asked for a timeout greater than zero, but less than a
jiffy, they clearly weren't planning on spinning. So it is better
to round up to one.
This fixes an issue with supertuxkart that was (for some reason)
spinning on a gl sync with 1ms timeout. CPU time for a demo lap
drops from:
15.83user 20.98system 0:47.46elapsed 77%CPU
drops to:
8.84user 2.30system 0:46.67elapsed 23%CPU
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/528725/
Link: https://lore.kernel.org/r/20230324220013.191795-1-robdclark@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Diffstat (limited to 'drivers/gpu/drm/msm/msm_io_utils.c')
0 files changed, 0 insertions, 0 deletions