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rtla-timerlat-hist.rst
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linux-6.19.14/Documentation/tools/rtla/rtla-timerlat-hist.rst
1.. |tool| replace:: timerlat hist 2 3===================== 4rtla-timerlat-hist 5===================== 6------------------------------------------------ 7Histograms of the operating system timer latency 8------------------------------------------------ 9 10:Manual section: 1 11 12SYNOPSIS 13======== 14**rtla timerlat hist** [*OPTIONS*] ... 15 16DESCRIPTION 17=========== 18 19.. include:: common_timerlat_description.txt 20 21The **rtla timerlat hist** displays a histogram of each tracer event 22occurrence. This tool uses the periodic information, and the 23**osnoise:** tracepoints are enabled when using the **-T** option. 24 25OPTIONS 26======= 27 28.. include:: common_timerlat_options.txt 29 30.. include:: common_hist_options.txt 31 32.. include:: common_options.txt 33 34.. include:: common_timerlat_aa.txt 35 36EXAMPLE 37======= 38In the example below, **rtla timerlat hist** is set to run for *10* minutes, 39in the cpus *0-4*, *skipping zero* only lines. Moreover, **rtla timerlat 40hist** will change the priority of the *timerlat* threads to run under 41*SCHED_DEADLINE* priority, with a *100us* runtime every *1ms* period. The 42*1ms* period is also passed to the *timerlat* tracer. Auto-analysis is disabled 43to reduce overhead :: 44 45 [root@alien ~]# timerlat hist -d 10m -c 0-4 -P d:100us:1ms -p 1000 --no-aa 46 # RTLA timerlat histogram 47 # Time unit is microseconds (us) 48 # Duration: 0 00:10:00 49 Index IRQ-000 Thr-000 IRQ-001 Thr-001 IRQ-002 Thr-002 IRQ-003 Thr-003 IRQ-004 Thr-004 50 0 276489 0 206089 0 466018 0 481102 0 205546 0 51 1 318327 35487 388149 30024 94531 48382 83082 71078 388026 55730 52 2 3282 122584 4019 126527 28231 109012 23311 89309 4568 98739 53 3 940 11815 837 9863 6209 16227 6895 17196 910 9780 54 4 444 17287 424 11574 2097 38443 2169 36736 462 13476 55 5 206 43291 255 25581 1223 101908 1304 101137 236 28913 56 6 132 101501 96 64584 635 213774 757 215471 99 73453 57 7 74 169347 65 124758 350 57466 441 53639 69 148573 58 8 53 85183 31 156751 229 9052 306 9026 39 139907 59 9 22 10387 12 42762 161 2554 225 2689 19 26192 60 10 13 1898 8 5770 114 1247 128 1405 13 3772 61 11 9 560 9 924 71 686 76 765 8 713 62 12 4 256 2 360 50 411 64 474 3 278 63 13 2 167 2 172 43 256 53 350 4 180 64 14 1 88 1 116 15 198 42 223 0 115 65 15 2 63 3 94 11 139 20 150 0 58 66 16 2 37 0 56 5 78 10 102 0 39 67 17 0 18 0 28 4 57 8 80 0 15 68 18 0 8 0 17 2 50 6 56 0 12 69 19 0 9 0 5 0 19 0 48 0 18 70 20 0 4 0 8 0 11 2 27 0 4 71 21 0 2 0 3 1 9 1 18 0 6 72 22 0 1 0 3 1 7 0 3 0 5 73 23 0 2 0 4 0 2 0 7 0 2 74 24 0 2 0 2 1 3 0 3 0 5 75 25 0 0 0 1 0 1 0 1 0 3 76 26 0 1 0 0 0 2 0 2 0 0 77 27 0 0 0 3 0 1 0 0 0 1 78 28 0 0 0 3 0 0 0 1 0 0 79 29 0 0 0 2 0 2 0 1 0 3 80 30 0 1 0 0 0 0 0 0 0 0 81 31 0 1 0 0 0 0 0 2 0 2 82 32 0 0 0 1 0 2 0 0 0 0 83 33 0 0 0 2 0 0 0 0 0 1 84 34 0 0 0 0 0 0 0 0 0 2 85 35 0 1 0 1 0 0 0 0 0 1 86 36 0 1 0 0 0 1 0 1 0 0 87 37 0 0 0 1 0 0 0 0 0 0 88 40 0 0 0 0 0 1 0 1 0 0 89 41 0 0 0 0 0 0 0 0 0 1 90 42 0 0 0 0 0 0 0 0 0 1 91 44 0 0 0 0 0 1 0 0 0 0 92 46 0 0 0 0 0 0 0 1 0 0 93 47 0 0 0 0 0 0 0 0 0 1 94 50 0 0 0 0 0 0 0 0 0 1 95 54 0 0 0 1 0 0 0 0 0 0 96 58 0 0 0 1 0 0 0 0 0 0 97 over: 0 0 0 0 0 0 0 0 0 0 98 count: 600002 600002 600002 600002 600002 600002 600002 600002 600002 600002 99 min: 0 1 0 1 0 1 0 1 0 1 100 avg: 0 5 0 5 0 4 0 4 0 5 101 max: 16 36 15 58 24 44 21 46 13 50 102 103SEE ALSO 104======== 105**rtla-timerlat**\(1), **rtla-timerlat-top**\(1) 106 107*timerlat* tracer documentation: <https://www.kernel.org/doc/html/latest/trace/timerlat-tracer.html> 108 109AUTHOR 110====== 111Written by Daniel Bristot de Oliveira <bristot@kernel.org> 112 113.. include:: common_appendix.txt
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