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Message-Id: <FB8E4CD4-DBC8-4D6D-AD2C-E038924967BC@lixiang.com>
Date: Tue, 21 Mar 2023 19:05:55 +0800
From: "Chunxin Zang" <zangchunxin@...iang.com>
To: "Mike Galbraith" <efault@....de>
Cc: "Namhyung Kim" <namhyung@...nel.org>, <peterz@...radead.org>,
<mingo@...hat.com>, <acme@...nel.org>, <mark.rutland@....com>,
<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
<irogers@...gle.com>, <linux-perf-users@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
"Jerry Zhou" <zhouchunhua@...iang.com>
Subject: Re: [PATCH v3] perf sched: Fix sched latency analysis incorrect
> On Mar 21, 2023, at 15:32, Mike Galbraith <efault@....de> wrote:
>
> On Fri, 2023-03-17 at 14:32 +0800, Chunxin Zang wrote:
>> 'perf sched latency' is incorrect to get process schedule latency
>> when it used 'sched:sched_wakeup' to analysis perf.data.
>>
>> Because 'perf record' prefer use 'sched:sched_waking' to
>> 'sched:sched_wakeup' since commit d566a9c2d482 ("perf sched: Prefer
>> sched_waking event when it exists"). It's very reasonable to
>> evaluate process schedule latency.
>
> Yeah, that makes a.. not so tiny difference. Thanks.
> (off to flush large pile of.. not data)
>
> su - mikeg -c 'google-chrome-stable https://www.youtube.com/watch?v=aqz-KE-bpKQ > /dev/null 2>&1'&
> massive_intr 8 9999&
> # allow time to select display size/res
> sleep 10
> perf sched record -a -- cyclictest -Smqi 1234 -d 0&
> sleep 300
> killall cyclictest
> sleep 1
> killall massive_intr chrome
>
> cyclictest output
> T: 0 (10255) P: 0 I:1234 C: 194367 Min: 4 Act: 55 Avg: 484 Max: 22776
> T: 1 (10256) P: 0 I:1234 C: 194346 Min: 6 Act: 57 Avg: 480 Max: 18589
> T: 2 (10257) P: 0 I:1234 C: 194034 Min: 5 Act: 5214 Avg: 482 Max: 18530
> T: 3 (10258) P: 0 I:1234 C: 192263 Min: 5 Act: 54 Avg: 513 Max: 19385
> T: 4 (10259) P: 0 I:1234 C: 193350 Min: 6 Act: 728 Avg: 492 Max: 15951
> T: 5 (10260) P: 0 I:1234 C: 196233 Min: 6 Act: 56 Avg: 469 Max: 17905
> T: 6 (10261) P: 0 I:1234 C: 194181 Min: 5 Act: 67 Avg: 482 Max: 17997
> T: 7 (10262) P: 0 I:1234 C: 196756 Min: 7 Act: 284 Avg: 468 Max: 16287
>
> cyclictest bits of perf sched lat -p output, sorted ala cyclictest (local hackletlet sums delay)
> -----------------------------------------------------------------------------------------------------------
> Task | Runtime ms | Switches | Avg delay ms | Max delay ms | Sum delay ms |
> -----------------------------------------------------------------------------------------------------------
> cyclictest:10255 | 1280.359 ms | 294 | avg: 0.238 ms | max: 4.929 ms | sum: 69.921 ms |
> cyclictest:10256 | 1293.976 ms | 163 | avg: 0.463 ms | max: 6.619 ms | sum: 75.497 ms |
> cyclictest:10257 | 1259.701 ms | 206 | avg: 0.371 ms | max: 5.659 ms | sum: 76.453 ms |
> cyclictest:10258 | 1299.337 ms | 171 | avg: 0.440 ms | max: 4.210 ms | sum: 75.267 ms |
> cyclictest:10259 | 1436.543 ms | 181 | avg: 0.472 ms | max: 8.466 ms | sum: 85.473 ms |
> cyclictest:10260 | 1401.824 ms | 210 | avg: 0.386 ms | max: 7.007 ms | sum: 81.036 ms |
> cyclictest:10261 | 1336.621 ms | 190 | avg: 0.387 ms | max: 4.244 ms | sum: 73.593 ms |
> cyclictest:10262 | 1393.249 ms | 283 | avg: 0.268 ms | max: 4.381 ms | sum: 75.778 ms |
> +patchlet
> cyclictest:10252 | 218.546 ms | 28657 | avg: 0.437 ms | max: 12.616 ms | sum:12514.777 ms | <== *poof*
I observed the different things is 'cyclictest:10252' data only exist in patchlet data.
So I run the 'perf sched record -a -- cyclictest -Smqi 1234 -d 0 ' try to find the reason.
I get the following data.
$: perf sched record -a -- ./cyclictest -Smqi 1234 -d 0
# /dev/cpu_dma_latency set to 0us
^C[ perf record: Woken up 41 times to write data ]
T: 0 (1188076) P: 0 I:1234 C: 5655 Min: 7 Act: 57 Avg: 57 Max: 1394
T: 1 (1188077) P: 0 I:1234 C: 5656 Min: 7 Act: 57 Avg: 56 Max: 86
T: 2 (1188078) P: 0 I:1234 C: 5654 Min: 6 Act: 57 Avg: 57 Max: 1133
T: 3 (1188079) P: 0 I:1234 C: 5653 Min: 7 Act: 58 Avg: 57 Max: 575
T: 4 (1188080) P: 0 I:1234 C: 5649 Min: 8 Act: 57 Avg: 57 Max: 2878
T: 5 (1188081) P: 0 I:1234 C: 5650 Min: 9 Act: 57 Avg: 56 Max: 420
T: 6 (1188082) P: 0 I:1234 C: 5642 Min: 8 Act: 57 Avg: 58 Max: 7944
T: 7 (1188083) P: 0 I:1234 C: 5647 Min: 7 Act: 57 Avg: 56 Max: 64
T: 8 (1188084) P: 0 I:1234 C: 5612 Min: 8 Act: 57 Avg: 66 Max: 10684
T: 9 (1188085) P: 0 I:1234 C: 5644 Min: 8 Act: 57 Avg: 56 Max: 127
T:10 (1188086) P: 0 I:1234 C: 5643 Min: 8 Act: 57 Avg: 56 Max: 118
T:11 (1188087) P: 0 I:1234 C: 5642 Min: 7 Act: 57 Avg: 56 Max: 64
T:12 (1188088) P: 0 I:1234 C: 5616 Min: 7 Act: 58 Avg: 65 Max: 9961
T:13 (1188089) P: 0 I:1234 C: 5638 Min: 7 Act: 57 Avg: 56 Max: 1545
T:14 (1188090) P: 0 I:1234 C: 5637 Min: 7 Act: 57 Avg: 57 Max: 1394
T:15 (1188091) P: 0 I:1234 C: 5636 Min: 7 Act: 57 Avg: 56 Max: 75
T:16 (1188092) P: 0 I:1234 C: 5634 Min: 5 Act: 55 Avg: 53 Max: 1528
T:17 (1188093) P: 0 I:1234 C: 5633 Min: 4 Act: 54 Avg: 53 Max: 315
T:18 (1188094) P: 0 I:1234 C: 5632 Min: 5 Act: 54 Avg: 53 Max: 85
T:19 (1188095) P: 0 I:1234 C: 5630 Min: 6 Act: 138 Avg: 38 Max: 1356
[ perf record: Captured and wrote 105.442 MB perf.data (923494 samples) ]
The old perf tools data.
$: perf sched latecy -p | grep cyclictest | sort
cyclictest:1152095 | 3.343 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152097 | 25.832 ms | 4 | avg: 0.003 ms | max: 0.004 ms | max start: 7371180.979819 s | max end: 7371180.979823 s
cyclictest:1152098 | 25.594 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152099 | 25.558 ms | 2 | avg: 0.003 ms | max: 0.006 ms | max start: 7371180.984052 s | max end: 7371180.984058 s
cyclictest:1152100 | 15.465 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152101 | 26.697 ms | 2 | avg: 0.003 ms | max: 0.005 ms | max start: 7371180.988301 s | max end: 7371180.988306 s
cyclictest:1152102 | 26.330 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152103 | 26.380 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152104 | 25.926 ms | 2 | avg: 0.003 ms | max: 0.006 ms | max start: 7371180.990549 s | max end: 7371180.990554 s
cyclictest:1152105 | 27.589 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152106 | 26.510 ms | 2 | avg: 0.003 ms | max: 0.005 ms | max start: 7371180.995015 s | max end: 7371180.995020 s
cyclictest:1152107 | 25.325 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152108 | 25.275 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152109 | 15.515 ms | 2 | avg: 0.002 ms | max: 0.004 ms | max start: 7371182.862877 s | max end: 7371182.862881 s
cyclictest:1152110 | 26.835 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152111 | 25.849 ms | 2 | avg: 0.001 ms | max: 0.002 ms | max start: 7371180.977996 s | max end: 7371180.977998 s
cyclictest:1152112 | 26.192 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152113 | 18.339 ms | 2 | avg: 0.002 ms | max: 0.005 ms | max start: 7371180.986046 s | max end: 7371180.986051 s
cyclictest:1152114 | 18.341 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152115 | 17.949 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1152116 | 19.291 ms | 4 | avg: 0.003 ms | max: 0.005 ms | max start: 7371180.363769 s | max end: 7371180.363774 s
cyclictest:1188074 | 38.122 ms | 1 | avg: 0.000 ms | max: 0.000 ms | max start: 0.000000 s | max end: 0.000000 s
cyclictest:1188076 | 26.020 ms | 2 | avg: 0.004 ms | max: 0.004 ms | max start: 7371180.984074 s | max end: 7371180.984078 s
cyclictest:1188077 | 25.949 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.884309 s | max end: 7371175.884313 s
cyclictest:1188078 | 26.184 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.886010 s | max end: 7371175.886014 s
cyclictest:1188079 | 28.886 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.887703 s | max end: 7371175.887707 s
cyclictest:1188080 | 25.228 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.889413 s | max end: 7371175.889417 s
cyclictest:1188081 | 25.239 ms | 3 | avg: 0.007 ms | max: 0.011 ms | max start: 7371180.965735 s | max end: 7371180.965746 s
cyclictest:1188082 | 25.371 ms | 2 | avg: 0.005 ms | max: 0.006 ms | max start: 7371180.965845 s | max end: 7371180.965851 s
cyclictest:1188083 | 26.238 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.894465 s | max end: 7371175.894469 s
cyclictest:1188084 | 25.658 ms | 3 | avg: 0.005 ms | max: 0.005 ms | max start: 7371180.967776 s | max end: 7371180.967781 s
cyclictest:1188085 | 26.492 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.897930 s | max end: 7371175.897934 s
cyclictest:1188086 | 26.397 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.899613 s | max end: 7371175.899617 s
cyclictest:1188087 | 26.481 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.901338 s | max end: 7371175.901342 s
cyclictest:1188088 | 29.591 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.903018 s | max end: 7371175.903022 s
cyclictest:1188089 | 25.619 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.904778 s | max end: 7371175.904782 s
cyclictest:1188090 | 30.952 ms | 4 | avg: 0.015 ms | max: 0.050 ms | max start: 7371180.975854 s | max end: 7371180.975903 s
cyclictest:1188091 | 26.220 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.908250 s | max end: 7371175.908254 s
cyclictest:1188092 | 18.931 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.909970 s | max end: 7371175.909974 s
cyclictest:1188093 | 19.135 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.911677 s | max end: 7371175.911681 s
cyclictest:1188094 | 19.145 ms | 1 | avg: 0.004 ms | max: 0.004 ms | max start: 7371175.913420 s | max end: 7371175.913424 s
cyclictest:1188095 | 19.193 ms | 1 | avg: 0.005 ms | max: 0.005 ms | max start: 7371175.915139 s | max end: 7371175.915144 s
The patchlet perf data.
$: /root/perf sched latency -i ./perf.data -p | grep cyclictest | sort
cyclictest:1152095 | 3.343 ms | 694 | avg: 0.003 ms | max: 0.206 ms | max start: 7371181.289279 s | max end: 7371181.289486 s
cyclictest:1152097 | 25.832 ms | 5663 | avg: 0.004 ms | max: 0.806 ms | max start: 7371180.245354 s | max end: 7371180.246160 s
cyclictest:1152098 | 25.594 ms | 5659 | avg: 0.003 ms | max: 0.016 ms | max start: 7371180.466516 s | max end: 7371180.466532 s
cyclictest:1152099 | 25.558 ms | 5660 | avg: 0.004 ms | max: 0.929 ms | max start: 7371180.962911 s | max end: 7371180.963840 s
cyclictest:1152100 | 15.465 ms | 5659 | avg: 0.006 ms | max: 0.525 ms | max start: 7371180.979260 s | max end: 7371180.979785 s
cyclictest:1152101 | 26.697 ms | 5659 | avg: 0.004 ms | max: 2.952 ms | max start: 7371180.250317 s | max end: 7371180.253269 s
cyclictest:1152102 | 26.330 ms | 5659 | avg: 0.003 ms | max: 0.359 ms | max start: 7371180.977488 s | max end: 7371180.977847 s
cyclictest:1152103 | 26.380 ms | 5652 | avg: 0.005 ms | max: 8.230 ms | max start: 7371180.227552 s | max end: 7371180.235782 s
cyclictest:1152104 | 25.926 ms | 5660 | avg: 0.003 ms | max: 0.060 ms | max start: 7371180.990483 s | max end: 7371180.990543 s
cyclictest:1152105 | 27.589 ms | 5620 | avg: 0.015 ms | max: 10.972 ms | max start: 7371180.804812 s | max end: 7371180.815785 s
cyclictest:1152106 | 26.510 ms | 5660 | avg: 0.003 ms | max: 0.158 ms | max start: 7371180.994849 s | max end: 7371180.995007 s
cyclictest:1152107 | 25.325 ms | 5659 | avg: 0.003 ms | max: 0.947 ms | max start: 7371180.986531 s | max end: 7371180.987478 s
cyclictest:1152108 | 25.275 ms | 5659 | avg: 0.003 ms | max: 0.129 ms | max start: 7371176.369231 s | max end: 7371176.369360 s
cyclictest:1152109 | 15.515 ms | 5627 | avg: 0.017 ms | max: 9.912 ms | max start: 7371180.228257 s | max end: 7371180.238169 s
cyclictest:1152110 | 26.835 ms | 5658 | avg: 0.003 ms | max: 1.647 ms | max start: 7371180.258250 s | max end: 7371180.259897 s
cyclictest:1152111 | 25.849 ms | 5659 | avg: 0.004 ms | max: 1.679 ms | max start: 7371180.242512 s | max end: 7371180.244191 s
cyclictest:1152112 | 26.192 ms | 5659 | avg: 0.003 ms | max: 0.009 ms | max start: 7371177.911768 s | max end: 7371177.911778 s
cyclictest:1152113 | 18.339 ms | 5660 | avg: 0.002 ms | max: 0.944 ms | max start: 7371180.246854 s | max end: 7371180.247797 s
cyclictest:1152114 | 18.341 ms | 5659 | avg: 0.002 ms | max: 0.423 ms | max start: 7371180.248383 s | max end: 7371180.248806 s
cyclictest:1152115 | 17.949 ms | 5659 | avg: 0.002 ms | max: 0.036 ms | max start: 7371175.960511 s | max end: 7371175.960548 s
cyclictest:1152116 | 19.291 ms | 5661 | avg: 0.005 ms | max: 1.324 ms | max start: 7371180.257638 s | max end: 7371180.258961 s
cyclictest:1188074 | 38.122 ms | 692 | avg: 0.003 ms | max: 0.010 ms | max start: 7371175.995600 s | max end: 7371175.995610 s
cyclictest:1188076 | 26.020 ms | 5656 | avg: 0.004 ms | max: 1.341 ms | max start: 7371180.244813 s | max end: 7371180.246154 s
cyclictest:1188077 | 25.949 ms | 5656 | avg: 0.003 ms | max: 0.033 ms | max start: 7371180.268781 s | max end: 7371180.268814 s
cyclictest:1188078 | 26.184 ms | 5654 | avg: 0.003 ms | max: 1.079 ms | max start: 7371180.962756 s | max end: 7371180.963835 s
cyclictest:1188079 | 28.886 ms | 5653 | avg: 0.004 ms | max: 0.521 ms | max start: 7371180.979258 s | max end: 7371180.979779 s
cyclictest:1188080 | 25.228 ms | 5650 | avg: 0.003 ms | max: 2.824 ms | max start: 7371180.250439 s | max end: 7371180.253263 s
cyclictest:1188081 | 25.239 ms | 5652 | avg: 0.003 ms | max: 0.349 ms | max start: 7371180.965380 s | max end: 7371180.965729 s
cyclictest:1188082 | 25.371 ms | 5643 | avg: 0.005 ms | max: 7.891 ms | max start: 7371180.227887 s | max end: 7371180.235778 s
cyclictest:1188083 | 26.238 ms | 5647 | avg: 0.003 ms | max: 0.010 ms | max start: 7371181.073635 s | max end: 7371181.073645 s
cyclictest:1188084 | 25.658 ms | 5614 | avg: 0.013 ms | max: 10.631 ms | max start: 7371180.805141 s | max end: 7371180.815771 s
cyclictest:1188085 | 26.492 ms | 5645 | avg: 0.003 ms | max: 0.073 ms | max start: 7371180.988249 s | max end: 7371180.988322 s
cyclictest:1188086 | 26.397 ms | 5643 | avg: 0.003 ms | max: 0.064 ms | max start: 7371177.544604 s | max end: 7371177.544667 s
cyclictest:1188087 | 26.481 ms | 5642 | avg: 0.003 ms | max: 0.011 ms | max start: 7371180.211768 s | max end: 7371180.211778 s
cyclictest:1188088 | 29.591 ms | 5617 | avg: 0.012 ms | max: 9.908 ms | max start: 7371180.228256 s | max end: 7371180.238165 s
cyclictest:1188089 | 25.619 ms | 5638 | avg: 0.003 ms | max: 1.490 ms | max start: 7371180.258401 s | max end: 7371180.259890 s
cyclictest:1188090 | 30.952 ms | 5640 | avg: 0.004 ms | max: 1.339 ms | max start: 7371180.242847 s | max end: 7371180.244186 s
cyclictest:1188091 | 26.220 ms | 5636 | avg: 0.003 ms | max: 0.022 ms | max start: 7371180.712279 s | max end: 7371180.712301 s
cyclictest:1188092 | 18.931 ms | 5634 | avg: 0.002 ms | max: 1.473 ms | max start: 7371180.246318 s | max end: 7371180.247791 s
cyclictest:1188093 | 19.135 ms | 5634 | avg: 0.002 ms | max: 0.259 ms | max start: 7371180.243086 s | max end: 7371180.243345 s
cyclictest:1188094 | 19.145 ms | 5632 | avg: 0.002 ms | max: 0.031 ms | max start: 7371180.244828 s | max end: 7371180.244859 s
cyclictest:1188095 | 19.193 ms | 5630 | avg: 0.003 ms | max: 1.314 ms | max start: 7371180.257641 s | max end: 7371180.258955 s
Obviously, there are some cases that are counted as zero in perf.data which is generated
by old perf tools, such as 'cyclictest:1152098'.
I use 'perf script' and get the following info.
swapper 0 [001] 7371175.879738: sched:sched_waking: comm=cyclictest pid=1152098 prio=125 target_cpu=001
swapper 0 [001] 7371175.879741: sched:sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=cyclictest next_pid=1152098 next_prio=125
cyclictest 1152098 [001] 7371175.879744: sched:sched_stat_runtime: comm=cyclictest pid=1152098 runtime=5279 [ns] vruntime=100770994135 [ns]
perf 1187996 [015] 7371175.879744: sched:sched_stat_runtime: comm=perf pid=1187996 runtime=24807 [ns] vruntime=28338406886 [ns]
cyclictest 1152098 [001] 7371175.879745: sched:sched_switch: prev_comm=cyclictest prev_pid=1152098 prev_prio=125 prev_state=S ==> next_comm=swapper/1 next_pid=0 next_prio=120
perf 1187996 [015] 7371175.879746: sched:sched_waking: comm=migration/15 pid=103 prio=0 target_cpu=015
... ...
swapper 0 [001] 7371175.880972: sched:sched_waking: comm=cyclictest pid=1152098 prio=125 target_cpu=001
swapper 0 [001] 7371175.880975: sched:sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=cyclictest next_pid=1152098 next_prio=125
cyclictest 1152098 [001] 7371175.880978: sched:sched_stat_runtime: comm=cyclictest pid=1152098 runtime=5481 [ns] vruntime=100771010888 [ns]
cyclictest 1152098 [001] 7371175.880979: sched:sched_switch: prev_comm=cyclictest prev_pid=1152098 prev_prio=125 prev_state=S ==> next_comm=swapper/1 next_pid=0 next_prio=120
In fact, the 'cyclictest:1152098' was sched_waking at 7371175.880972, and sched_switch
at 7371175.880975 in second context, so it's can't be zero.
The reason is the old perf tools isn't use 'sched_waking' event to analysis data,
and 'cyclictest:1152098' state is 'S' on previous sched_switch at 7371175.879745,
the perf tools isn't find the beginning time of 'cyclictest:1152098' which was putted on runqueue in perf.data.
cyclictest 1152097 [000] 7371180.979817: sched:sched_waking: comm=kworker/0:2 pid=1074142 prio=120 target_cpu=000
cut 1188136 [012] 7371180.979818: sched:sched_stat_runtime: comm=cut pid=1188136 runtime=2024 [ns] vruntime=232844433506260 [ns]
cyclictest 1152097 [000] 7371180.979818: sched:sched_stat_runtime: comm=cyclictest pid=1152097 runtime=4303 [ns] vruntime=505223436640 [ns]
cyclictest 1152097 [000] 7371180.979819: sched:sched_switch: prev_comm=cyclictest prev_pid=1152097 prev_prio=125 prev_state=R ==> next_comm=kworker/0:2 next_pid=1074142 next_prio=120
:-1 -1 [012] 7371180.979822: sched:sched_waking: comm=migration/2 pid=25 prio=0 target_cpu=002
kworker/0:2-eve 1074142 [000] 7371180.979822: sched:sched_stat_runtime: comm=kworker/0:2 pid=1074142 runtime=5032 [ns] vruntime=113645059997114 [ns]
kworker/0:2-eve 1074142 [000] 7371180.979823: sched:sched_switch: prev_comm=kworker/0:2 prev_pid=1074142 prev_prio=120 prev_state=I ==> next_comm=cyclictest next_pid=1152097 next_prio=125
:-1 -1 [012] 7371180.979823: sched:sched_switch: prev_comm=cut prev_pid=1188136 prev_prio=120 prev_state=X ==> next_comm=swapper/12 next_pid=0 next_prio=120
The 'cyclictest:1152097' case is't counted as zero is because of it's state is 'R'
in previous sched_switch at 7371180.979819, and old perf tools is find the beginning
time when it was putted on runqueue.
That's the issue which I want to fix.
And the reason may be makes you get the difference result in your context.
Best wishes
-Chunxin
> cyclictest:10255 | 1280.359 ms | 194661 | avg: 0.431 ms | max: 22.722 ms | sum:83954.384 ms |
> cyclictest:10256 | 1293.976 ms | 194509 | avg: 0.427 ms | max: 18.537 ms | sum:83115.895 ms |
> cyclictest:10257 | 1259.701 ms | 194240 | avg: 0.429 ms | max: 18.509 ms | sum:83408.424 ms |
> cyclictest:10258 | 1299.337 ms | 192434 | avg: 0.460 ms | max: 19.331 ms | sum:88555.775 ms |
> cyclictest:10259 | 1436.543 ms | 193531 | avg: 0.439 ms | max: 15.897 ms | sum:84989.121 ms |
> cyclictest:10260 | 1401.824 ms | 196443 | avg: 0.417 ms | max: 17.852 ms | sum:81818.898 ms |
> cyclictest:10261 | 1336.621 ms | 194371 | avg: 0.429 ms | max: 17.944 ms | sum:83443.732 ms |
> cyclictest:10262 | 1393.249 ms | 197039 | avg: 0.415 ms | max: 16.232 ms | sum:81752.473 ms |
>
>
> -Mike
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