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