rtla: Add rtla timerlat hist documentation
Man page for rtla timerlat hist mode. Link: https://lkml.kernel.org/r/4a184003fdb81e23be3fe5ec882b1c89d5a95458.1639158831.git.bristot@kernel.org Cc: Tao Zhou <tao.zhou@linux.dev> Cc: Ingo Molnar <mingo@redhat.com> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Daniel Bristot de Oliveira <bristot@kernel.org> Cc: linux-rt-users@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Daniel Bristot de Oliveira
Steven Rostedt
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=====================
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rtla-timerlat-hist
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=====================
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------------------------------------------------
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Histograms of the operating system timer latency
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------------------------------------------------
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:Manual section: 1
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SYNOPSIS
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========
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**rtla timerlat hist** [*OPTIONS*] ...
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DESCRIPTION
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===========
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.. include:: common_timerlat_description.rst
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The **rtla timerlat hist** displays a histogram of each tracer event
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occurrence. This tool uses the periodic information, and the
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**osnoise:** tracepoints are enabled when using the **-T** option.
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OPTIONS
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=======
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.. include:: common_timerlat_options.rst
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.. include:: common_hist_options.rst
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.. include:: common_options.rst
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EXAMPLE
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=======
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In the example below, **rtla timerlat hist** is set to run for *10* minutes,
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in the cpus *0-4*, *skipping zero* only lines. Moreover, **rtla timerlat
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hist** will change the priority of the *timelat* threads to run under
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*SCHED_DEADLINE* priority, with a *10us* runtime every *1ms* period. The
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*1ms* period is also passed to the *timerlat* tracer::
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[root@alien ~]# timerlat hist -d 10m -c 0-4 -P d:100us:1ms -p 1ms
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# RTLA timerlat histogram
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# Time unit is microseconds (us)
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# Duration: 0 00:10:00
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Index IRQ-000 Thr-000 IRQ-001 Thr-001 IRQ-002 Thr-002 IRQ-003 Thr-003 IRQ-004 Thr-004
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0 276489 0 206089 0 466018 0 481102 0 205546 0
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1 318327 35487 388149 30024 94531 48382 83082 71078 388026 55730
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2 3282 122584 4019 126527 28231 109012 23311 89309 4568 98739
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3 940 11815 837 9863 6209 16227 6895 17196 910 9780
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4 444 17287 424 11574 2097 38443 2169 36736 462 13476
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5 206 43291 255 25581 1223 101908 1304 101137 236 28913
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6 132 101501 96 64584 635 213774 757 215471 99 73453
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7 74 169347 65 124758 350 57466 441 53639 69 148573
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8 53 85183 31 156751 229 9052 306 9026 39 139907
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9 22 10387 12 42762 161 2554 225 2689 19 26192
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10 13 1898 8 5770 114 1247 128 1405 13 3772
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11 9 560 9 924 71 686 76 765 8 713
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12 4 256 2 360 50 411 64 474 3 278
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13 2 167 2 172 43 256 53 350 4 180
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14 1 88 1 116 15 198 42 223 0 115
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15 2 63 3 94 11 139 20 150 0 58
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16 2 37 0 56 5 78 10 102 0 39
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17 0 18 0 28 4 57 8 80 0 15
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18 0 8 0 17 2 50 6 56 0 12
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19 0 9 0 5 0 19 0 48 0 18
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20 0 4 0 8 0 11 2 27 0 4
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21 0 2 0 3 1 9 1 18 0 6
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22 0 1 0 3 1 7 0 3 0 5
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23 0 2 0 4 0 2 0 7 0 2
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24 0 2 0 2 1 3 0 3 0 5
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25 0 0 0 1 0 1 0 1 0 3
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26 0 1 0 0 0 2 0 2 0 0
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27 0 0 0 3 0 1 0 0 0 1
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28 0 0 0 3 0 0 0 1 0 0
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29 0 0 0 2 0 2 0 1 0 3
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30 0 1 0 0 0 0 0 0 0 0
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31 0 1 0 0 0 0 0 2 0 2
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32 0 0 0 1 0 2 0 0 0 0
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33 0 0 0 2 0 0 0 0 0 1
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34 0 0 0 0 0 0 0 0 0 2
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35 0 1 0 1 0 0 0 0 0 1
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36 0 1 0 0 0 1 0 1 0 0
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37 0 0 0 1 0 0 0 0 0 0
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40 0 0 0 0 0 1 0 1 0 0
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41 0 0 0 0 0 0 0 0 0 1
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42 0 0 0 0 0 0 0 0 0 1
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44 0 0 0 0 0 1 0 0 0 0
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46 0 0 0 0 0 0 0 1 0 0
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47 0 0 0 0 0 0 0 0 0 1
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50 0 0 0 0 0 0 0 0 0 1
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54 0 0 0 1 0 0 0 0 0 0
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58 0 0 0 1 0 0 0 0 0 0
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over: 0 0 0 0 0 0 0 0 0 0
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count: 600002 600002 600002 600002 600002 600002 600002 600002 600002 600002
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min: 0 1 0 1 0 1 0 1 0 1
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avg: 0 5 0 5 0 4 0 4 0 5
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max: 16 36 15 58 24 44 21 46 13 50
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SEE ALSO
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========
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**rtla-timerlat**\(1), **rtla-timerlat-top**\(1)
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*timerlat* tracer documentation: <https://www.kernel.org/doc/html/latest/trace/timerlat-tracer.html>
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AUTHOR
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======
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Written by Daniel Bristot de Oliveira <bristot@kernel.org>
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