Re: [PATCH 2/2] sched/eevdf: Use sched_attr::sched_runtime to set request/slice suggestion
From: Mike Galbraith
Date: Sun Sep 24 2023 - 05:27:36 EST
On Tue, 2023-09-19 at 09:53 +0200, Mike Galbraith wrote:
> On Fri, 2023-09-15 at 14:43 +0200, peterz@xxxxxxxxxxxxx wrote:
> > Allow applications to directly set a suggested request/slice length using
> > sched_attr::sched_runtime.
>
> I met an oddity while fiddling to see what a custom slice would do for
> cyclictest, it seeming to be reasonable target...
For the record, that cyclictest oddity was the mixed slice handling
improvement patch from the latency-nice branch not doing so well at the
ultralight end of the spectrum. Turning the feature off eliminated it.
Some numbers for the terminally bored below.
-Mike
5 minutes of repeatable mixed load, Blender 1920x1080@24 YouTube clip
(no annoying ads) vs massive_intr (4x88% hogs) with cyclictest -D 300
doing the profile duration timing in dinky/cute rpi4. Filenames
describe slice and feature settings, fudge in filename means feature
was turned on.
perf sched lat -i perf.data.full.6.6.0-rc2-v8.stock --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(5) | 816065.611 ms | 917839 | avg: 0.255 ms | max: 42.579 ms | sum:234075.309 ms |
chromium-browse:(16) | 59428.589 ms | 138489 | avg: 0.507 ms | max: 28.546 ms | sum:70262.946 ms |
ThreadPoolForeg:(49) | 32962.888 ms | 57147 | avg: 0.916 ms | max: 35.043 ms | sum:52354.576 ms |
mutter:1352 | 24910.265 ms | 52058 | avg: 0.556 ms | max: 21.166 ms | sum:28945.039 ms |
Chrome_ChildIOT:(14) | 23785.517 ms | 132307 | avg: 0.345 ms | max: 30.987 ms | sum:45657.621 ms |
VizCompositorTh:30768 | 14985.421 ms | 64769 | avg: 0.432 ms | max: 24.620 ms | sum:27981.948 ms |
Xorg:925 | 14802.426 ms | 67407 | avg: 0.339 ms | max: 23.912 ms | sum:22844.860 ms |
alsa-sink-MAI P:1260 | 13958.874 ms | 33127 | avg: 0.023 ms | max: 15.023 ms | sum: 756.454 ms |
cyclictest:(5) | 13345.073 ms | 715171 | avg: 0.271 ms | max: 19.277 ms | sum:193861.885 ms |
Media:30834 | 12627.366 ms | 64061 | avg: 0.339 ms | max: 29.811 ms | sum:21687.561 ms |
ThreadPoolSingl:(6) | 9254.163 ms | 43524 | avg: 0.405 ms | max: 21.251 ms | sum:17617.750 ms |
V4L2DecoderThre:30887 | 9251.235 ms | 63002 | avg: 0.302 ms | max: 16.819 ms | sum:19000.280 ms |
VideoFrameCompo:30836 | 7947.943 ms | 47459 | avg: 0.300 ms | max: 19.666 ms | sum:14254.378 ms |
pulseaudio:1172 | 6638.018 ms | 43467 | avg: 0.219 ms | max: 14.621 ms | sum: 9535.951 ms |
threaded-ml:30883 | 5358.744 ms | 29193 | avg: 0.349 ms | max: 12.893 ms | sum:10175.289 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |1109784.680 ms | 3029507 | | 42.579 ms | 845307.017 ms |
----------------------------------------------------------------------------------------------------------
INFO: 0.001% context switch bugs (13 out of 1909170)
perf sched lat -i perf.data.full.6.6.0-rc2-v8.massive_intr-100ms-slice --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(5) | 861639.948 ms | 812113 | avg: 0.277 ms | max: 138.492 ms | sum:224707.956 ms |
chromium-browse:(8) | 51307.141 ms | 125222 | avg: 0.530 ms | max: 42.935 ms | sum:66314.290 ms |
ThreadPoolForeg:(16) | 26421.979 ms | 45000 | avg: 0.873 ms | max: 35.752 ms | sum:39306.544 ms |
Chrome_ChildIOT:(5) | 22542.183 ms | 131172 | avg: 0.336 ms | max: 51.751 ms | sum:44091.954 ms |
mutter:1352 | 21835.334 ms | 48508 | avg: 0.566 ms | max: 37.495 ms | sum:27446.519 ms |
VizCompositorTh:39048 | 14531.018 ms | 63787 | avg: 0.463 ms | max: 56.326 ms | sum:29522.218 ms |
Xorg:925 | 14497.447 ms | 67315 | avg: 0.397 ms | max: 36.714 ms | sum:26735.175 ms |
alsa-sink-MAI P:1260 | 13935.472 ms | 33111 | avg: 0.020 ms | max: 6.753 ms | sum: 677.888 ms |
cyclictest:(5) | 12696.835 ms | 653111 | avg: 0.425 ms | max: 38.092 ms | sum:277440.622 ms |
Media:39089 | 12571.118 ms | 67187 | avg: 0.335 ms | max: 26.660 ms | sum:22498.438 ms |
V4L2DecoderThre:39125 | 9156.299 ms | 66378 | avg: 0.301 ms | max: 23.828 ms | sum:19991.504 ms |
ThreadPoolSingl:(4) | 9079.291 ms | 46187 | avg: 0.377 ms | max: 28.850 ms | sum:17422.535 ms |
VideoFrameCompo:39091 | 8103.756 ms | 50025 | avg: 0.290 ms | max: 33.230 ms | sum:14518.688 ms |
pulseaudio:1172 | 6575.897 ms | 44952 | avg: 0.259 ms | max: 19.937 ms | sum:11630.128 ms |
threaded-ml:39123 | 5367.921 ms | 29503 | avg: 0.339 ms | max: 24.648 ms | sum: 9993.313 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |1127978.646 ms | 2802143 | | 138.492 ms | 920177.765 ms |
----------------------------------------------------------------------------------------------------------
INFO: 0.000% context switch bugs (8 out of 1773282)
perf sched lat -i perf.data.full.6.6.0-rc2-v8.massive_intr-100ms-slice-fudge --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(5) | 855426.748 ms | 777984 | avg: 0.266 ms | max: 111.756 ms | sum:206723.857 ms |
chromium-browse:(8) | 51656.331 ms | 122631 | avg: 0.531 ms | max: 36.305 ms | sum:65094.280 ms |
ThreadPoolForeg:(16) | 27473.845 ms | 43053 | avg: 0.972 ms | max: 34.973 ms | sum:41833.237 ms |
mutter:1352 | 21412.313 ms | 47476 | avg: 0.541 ms | max: 33.553 ms | sum:25685.892 ms |
Chrome_ChildIOT:(5) | 20283.623 ms | 119424 | avg: 0.395 ms | max: 31.266 ms | sum:47164.449 ms |
VizCompositorTh:36026 | 14643.428 ms | 63979 | avg: 0.464 ms | max: 34.832 ms | sum:29708.794 ms |
Xorg:925 | 14296.586 ms | 67756 | avg: 0.410 ms | max: 23.774 ms | sum:27811.107 ms |
alsa-sink-MAI P:1260 | 13977.823 ms | 33116 | avg: 0.023 ms | max: 5.513 ms | sum: 750.004 ms |
cyclictest:(5) | 12365.030 ms | 645151 | avg: 0.475 ms | max: 35.084 ms | sum:306236.764 ms |
Media:36076 | 12256.872 ms | 60848 | avg: 0.378 ms | max: 26.714 ms | sum:22978.110 ms |
ThreadPoolSingl:(4) | 8983.939 ms | 43538 | avg: 0.401 ms | max: 21.137 ms | sum:17468.417 ms |
V4L2DecoderThre:36101 | 8910.124 ms | 58505 | avg: 0.316 ms | max: 22.654 ms | sum:18503.766 ms |
VideoFrameCompo:36081 | 7851.251 ms | 44655 | avg: 0.325 ms | max: 24.662 ms | sum:14532.619 ms |
pulseaudio:1172 | 6671.226 ms | 44172 | avg: 0.332 ms | max: 19.466 ms | sum:14673.304 ms |
threaded-ml:36099 | 5338.302 ms | 28879 | avg: 0.379 ms | max: 20.754 ms | sum:10944.051 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |1115349.047 ms | 2703902 | | 111.756 ms | 959507.323 ms |
----------------------------------------------------------------------------------------------------------
INFO: 0.000% context switch bugs (4 out of 1763882)
perf sched lat -i perf.data.full.6.6.0-rc2-v8.cyclictest-500us-slice --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(5) | 847672.515 ms | 951686 | avg: 0.233 ms | max: 30.660 ms | sum:222000.736 ms |
chromium-browse:(8) | 53628.292 ms | 133414 | avg: 0.456 ms | max: 30.414 ms | sum:60792.606 ms |
ThreadPoolForeg:(17) | 26765.405 ms | 43894 | avg: 0.869 ms | max: 43.268 ms | sum:38131.378 ms |
mutter:1352 | 22161.746 ms | 49865 | avg: 0.514 ms | max: 24.773 ms | sum:25639.654 ms |
Chrome_ChildIOT:(7) | 20878.044 ms | 122989 | avg: 0.315 ms | max: 44.034 ms | sum:38735.550 ms |
Xorg:925 | 14647.685 ms | 66766 | avg: 0.326 ms | max: 16.256 ms | sum:21785.616 ms |
VizCompositorTh:34571 | 14304.582 ms | 64222 | avg: 0.401 ms | max: 23.334 ms | sum:25767.033 ms |
alsa-sink-MAI P:1260 | 14006.042 ms | 33136 | avg: 0.022 ms | max: 4.851 ms | sum: 724.564 ms |
cyclictest:(5) | 13404.228 ms | 731243 | avg: 0.217 ms | max: 28.997 ms | sum:158740.145 ms |
Media:34626 | 12790.442 ms | 63825 | avg: 0.327 ms | max: 30.721 ms | sum:20853.022 ms |
V4L2DecoderThre:34651 | 9278.538 ms | 62619 | avg: 0.284 ms | max: 18.678 ms | sum:17761.070 ms |
ThreadPoolSingl:(4) | 9226.802 ms | 42846 | avg: 0.389 ms | max: 18.563 ms | sum:16684.938 ms |
VideoFrameCompo:34627 | 7788.047 ms | 46681 | avg: 0.285 ms | max: 14.102 ms | sum:13327.258 ms |
pulseaudio:1172 | 6643.612 ms | 42393 | avg: 0.186 ms | max: 7.567 ms | sum: 7873.616 ms |
threaded-ml:34649 | 5402.911 ms | 28737 | avg: 0.313 ms | max: 13.276 ms | sum: 9007.151 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |1114449.900 ms | 3009626 | | 44.034 ms | 740410.836 ms |
----------------------------------------------------------------------------------------------------------
INFO: 0.000% context switch bugs (8 out of 1873597)
perf sched lat -i perf.data.full.6.6.0-rc2-v8.cyclictest-500us-slice-fudge --sort=runtime -S 15 -T
----------------------------------------------------------------------------------------------------------
Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
----------------------------------------------------------------------------------------------------------
massive_intr:(5) | 838981.090 ms | 880877 | avg: 0.262 ms | max: 28.559 ms | sum:230982.334 ms |
chromium-browse:(9) | 55497.942 ms | 128916 | avg: 0.520 ms | max: 39.331 ms | sum:67042.536 ms |
ThreadPoolForeg:(20) | 27669.981 ms | 41272 | avg: 0.990 ms | max: 29.775 ms | sum:40857.370 ms |
mutter:1352 | 22455.332 ms | 47362 | avg: 0.562 ms | max: 19.838 ms | sum:26611.559 ms |
Chrome_ChildIOT:(7) | 22295.707 ms | 123559 | avg: 0.344 ms | max: 29.449 ms | sum:42479.505 ms |
Xorg:925 | 14894.399 ms | 65930 | avg: 0.353 ms | max: 17.650 ms | sum:23303.557 ms |
VizCompositorTh:37170 | 14567.478 ms | 62477 | avg: 0.438 ms | max: 25.008 ms | sum:27366.073 ms |
alsa-sink-MAI P:1260 | 14207.866 ms | 33134 | avg: 0.022 ms | max: 4.092 ms | sum: 744.586 ms |
cyclictest:(5) | 13483.280 ms | 697504 | avg: 0.375 ms | max: 20.859 ms | sum:261834.795 ms |
Media:37224 | 12890.016 ms | 62641 | avg: 0.343 ms | max: 14.333 ms | sum:21510.222 ms |
ThreadPoolSingl:(4) | 9095.635 ms | 42121 | avg: 0.383 ms | max: 17.168 ms | sum:16116.408 ms |
V4L2DecoderThre:37261 | 9079.051 ms | 63220 | avg: 0.291 ms | max: 18.144 ms | sum:18421.175 ms |
VideoFrameCompo:37226 | 8049.344 ms | 46145 | avg: 0.309 ms | max: 18.575 ms | sum:14252.577 ms |
pulseaudio:1172 | 6767.263 ms | 42736 | avg: 0.205 ms | max: 8.202 ms | sum: 8781.668 ms |
threaded-ml:37262 | 5404.490 ms | 28428 | avg: 0.332 ms | max: 17.758 ms | sum: 9424.566 ms |
----------------------------------------------------------------------------------------------------------
TOTAL: |1115092.327 ms | 2896377 | | 39.331 ms | 881443.337 ms |
----------------------------------------------------------------------------------------------------------
INFO: 0.001% context switch bugs (12 out of 1845612)
Peeks out window at lovely sunny Sunday, and <poof>