rtla-timerlat-hist.rst (7179B)
1===================== 2rtla-timerlat-hist 3===================== 4------------------------------------------------ 5Histograms of the operating system timer latency 6------------------------------------------------ 7 8:Manual section: 1 9 10SYNOPSIS 11======== 12**rtla timerlat hist** [*OPTIONS*] ... 13 14DESCRIPTION 15=========== 16 17.. include:: common_timerlat_description.rst 18 19The **rtla timerlat hist** displays a histogram of each tracer event 20occurrence. This tool uses the periodic information, and the 21**osnoise:** tracepoints are enabled when using the **-T** option. 22 23OPTIONS 24======= 25 26.. include:: common_timerlat_options.rst 27 28.. include:: common_hist_options.rst 29 30.. include:: common_options.rst 31 32EXAMPLE 33======= 34In the example below, **rtla timerlat hist** is set to run for *10* minutes, 35in the cpus *0-4*, *skipping zero* only lines. Moreover, **rtla timerlat 36hist** will change the priority of the *timelat* threads to run under 37*SCHED_DEADLINE* priority, with a *10us* runtime every *1ms* period. The 38*1ms* period is also passed to the *timerlat* tracer:: 39 40 [root@alien ~]# timerlat hist -d 10m -c 0-4 -P d:100us:1ms -p 1ms 41 # RTLA timerlat histogram 42 # Time unit is microseconds (us) 43 # Duration: 0 00:10:00 44 Index IRQ-000 Thr-000 IRQ-001 Thr-001 IRQ-002 Thr-002 IRQ-003 Thr-003 IRQ-004 Thr-004 45 0 276489 0 206089 0 466018 0 481102 0 205546 0 46 1 318327 35487 388149 30024 94531 48382 83082 71078 388026 55730 47 2 3282 122584 4019 126527 28231 109012 23311 89309 4568 98739 48 3 940 11815 837 9863 6209 16227 6895 17196 910 9780 49 4 444 17287 424 11574 2097 38443 2169 36736 462 13476 50 5 206 43291 255 25581 1223 101908 1304 101137 236 28913 51 6 132 101501 96 64584 635 213774 757 215471 99 73453 52 7 74 169347 65 124758 350 57466 441 53639 69 148573 53 8 53 85183 31 156751 229 9052 306 9026 39 139907 54 9 22 10387 12 42762 161 2554 225 2689 19 26192 55 10 13 1898 8 5770 114 1247 128 1405 13 3772 56 11 9 560 9 924 71 686 76 765 8 713 57 12 4 256 2 360 50 411 64 474 3 278 58 13 2 167 2 172 43 256 53 350 4 180 59 14 1 88 1 116 15 198 42 223 0 115 60 15 2 63 3 94 11 139 20 150 0 58 61 16 2 37 0 56 5 78 10 102 0 39 62 17 0 18 0 28 4 57 8 80 0 15 63 18 0 8 0 17 2 50 6 56 0 12 64 19 0 9 0 5 0 19 0 48 0 18 65 20 0 4 0 8 0 11 2 27 0 4 66 21 0 2 0 3 1 9 1 18 0 6 67 22 0 1 0 3 1 7 0 3 0 5 68 23 0 2 0 4 0 2 0 7 0 2 69 24 0 2 0 2 1 3 0 3 0 5 70 25 0 0 0 1 0 1 0 1 0 3 71 26 0 1 0 0 0 2 0 2 0 0 72 27 0 0 0 3 0 1 0 0 0 1 73 28 0 0 0 3 0 0 0 1 0 0 74 29 0 0 0 2 0 2 0 1 0 3 75 30 0 1 0 0 0 0 0 0 0 0 76 31 0 1 0 0 0 0 0 2 0 2 77 32 0 0 0 1 0 2 0 0 0 0 78 33 0 0 0 2 0 0 0 0 0 1 79 34 0 0 0 0 0 0 0 0 0 2 80 35 0 1 0 1 0 0 0 0 0 1 81 36 0 1 0 0 0 1 0 1 0 0 82 37 0 0 0 1 0 0 0 0 0 0 83 40 0 0 0 0 0 1 0 1 0 0 84 41 0 0 0 0 0 0 0 0 0 1 85 42 0 0 0 0 0 0 0 0 0 1 86 44 0 0 0 0 0 1 0 0 0 0 87 46 0 0 0 0 0 0 0 1 0 0 88 47 0 0 0 0 0 0 0 0 0 1 89 50 0 0 0 0 0 0 0 0 0 1 90 54 0 0 0 1 0 0 0 0 0 0 91 58 0 0 0 1 0 0 0 0 0 0 92 over: 0 0 0 0 0 0 0 0 0 0 93 count: 600002 600002 600002 600002 600002 600002 600002 600002 600002 600002 94 min: 0 1 0 1 0 1 0 1 0 1 95 avg: 0 5 0 5 0 4 0 4 0 5 96 max: 16 36 15 58 24 44 21 46 13 50 97 98SEE ALSO 99======== 100**rtla-timerlat**\(1), **rtla-timerlat-top**\(1) 101 102*timerlat* tracer documentation: <https://www.kernel.org/doc/html/latest/trace/timerlat-tracer.html> 103 104AUTHOR 105====== 106Written by Daniel Bristot de Oliveira <bristot@kernel.org>