[J/realtime][PATCH 11/15] rtla: Add rtla osnoise hist documentation
Krzysztof Kozlowski
krzysztof.kozlowski at canonical.com
Wed Jan 26 18:58:08 UTC 2022
From: Daniel Bristot de Oliveira <bristot at kernel.org>
BugLink: https://bugs.launchpad.net/bugs/1959130
Man page for rtla osnoise hist mode.
Link: https://lkml.kernel.org/r/d43cc5d516b8db180575c4b66c4aa67c6a724a8d.1639158831.git.bristot@kernel.org
Cc: Tao Zhou <tao.zhou at linux.dev>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Tom Zanussi <zanussi at kernel.org>
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Juri Lelli <juri.lelli at redhat.com>
Cc: Clark Williams <williams at redhat.com>
Cc: John Kacur <jkacur at redhat.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Cc: Daniel Bristot de Oliveira <bristot at kernel.org>
Cc: linux-rt-users at vger.kernel.org
Cc: linux-trace-devel at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot at kernel.org>
Signed-off-by: Steven Rostedt <rostedt at goodmis.org>
(cherry picked from commit e7041c6b3c123ef2160ff7a948e458f8241e4e03)
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>
---
.../tools/rtla/common_hist_options.rst | 23 +++++++
.../tools/rtla/rtla-osnoise-hist.rst | 66 +++++++++++++++++++
2 files changed, 89 insertions(+)
create mode 100644 Documentation/tools/rtla/common_hist_options.rst
create mode 100644 Documentation/tools/rtla/rtla-osnoise-hist.rst
diff --git a/Documentation/tools/rtla/common_hist_options.rst b/Documentation/tools/rtla/common_hist_options.rst
new file mode 100644
index 000000000000..0266cd08a6c9
--- /dev/null
+++ b/Documentation/tools/rtla/common_hist_options.rst
@@ -0,0 +1,23 @@
+**-b**, **--bucket-size** *N*
+
+ Set the histogram bucket size (default *1*).
+
+**-e**, **--entries** *N*
+
+ Set the number of entries of the histogram (default 256).
+
+**--no-header**
+
+ Do not print header.
+
+**--no-summary**
+
+ Do not print summary.
+
+**--no-index**
+
+ Do not print index.
+
+**--with-zeros**
+
+ Print zero only entries.
diff --git a/Documentation/tools/rtla/rtla-osnoise-hist.rst b/Documentation/tools/rtla/rtla-osnoise-hist.rst
new file mode 100644
index 000000000000..52298ddd8701
--- /dev/null
+++ b/Documentation/tools/rtla/rtla-osnoise-hist.rst
@@ -0,0 +1,66 @@
+===================
+rtla-osnoise-hist
+===================
+------------------------------------------------------
+Display a histogram of the osnoise tracer samples
+------------------------------------------------------
+
+:Manual section: 1
+
+SYNOPSIS
+========
+**rtla osnoise hist** [*OPTIONS*]
+
+DESCRIPTION
+===========
+.. include:: common_osnoise_description.rst
+
+The **rtla osnoise hist** tool collects all **osnoise:sample_threshold**
+occurrence in a histogram, displaying the results in a user-friendly way.
+The tool also allows many configurations of the *osnoise* tracer and the
+collection of the tracer output.
+
+OPTIONS
+=======
+.. include:: common_osnoise_options.rst
+
+.. include:: common_hist_options.rst
+
+.. include:: common_options.rst
+
+EXAMPLE
+=======
+In the example below, *osnoise* tracer threads are set to run with real-time
+priority *FIFO:1*, on CPUs *0-11*, for *900ms* at each period (*1s* by
+default). The reason for reducing the runtime is to avoid starving the
+**rtla** tool. The tool is also set to run for *one minute*. The output
+histogram is set to group outputs in buckets of *10us* and *25* entries::
+
+ [root at f34 ~/]# rtla osnoise hist -P F:1 -c 0-11 -r 900000 -d 1M -b 10 -e 25
+ # RTLA osnoise histogram
+ # Time unit is microseconds (us)
+ # Duration: 0 00:01:00
+ Index CPU-000 CPU-001 CPU-002 CPU-003 CPU-004 CPU-005 CPU-006 CPU-007 CPU-008 CPU-009 CPU-010 CPU-011
+ 0 42982 46287 51779 53740 52024 44817 49898 36500 50408 50128 49523 52377
+ 10 12224 8356 2912 878 2667 10155 4573 18894 4214 4836 5708 2413
+ 20 8 5 12 2 13 24 20 41 29 53 39 39
+ 30 1 1 0 0 10 3 6 19 15 31 30 38
+ 40 0 0 0 0 0 4 2 7 2 3 8 11
+ 50 0 0 0 0 0 0 0 0 0 1 1 2
+ over: 0 0 0 0 0 0 0 0 0 0 0 0
+ count: 55215 54649 54703 54620 54714 55003 54499 55461 54668 55052 55309 54880
+ min: 0 0 0 0 0 0 0 0 0 0 0 0
+ avg: 0 0 0 0 0 0 0 0 0 0 0 0
+ max: 30 30 20 20 30 40 40 40 40 50 50 50
+
+SEE ALSO
+========
+**rtla-osnoise**\(1), **rtla-osnoise-top**\(1)
+
+*osnoise* tracer documentation: <https://www.kernel.org/doc/html/latest/trace/osnoise-tracer.html>
+
+AUTHOR
+======
+Written by Daniel Bristot de Oliveira <bristot at kernel.org>
+
+.. include:: common_appendix.rst
--
2.32.0
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