[J/realtime][PATCH 09/15] rtla: Add rtla osnoise man page

[Krzysztof Kozlowski]

From: Daniel Bristot de Oliveira <bristot at kernel.org>

BugLink: https://bugs.launchpad.net/bugs/1959130

Man page for rtla osnoise command.

Link: https://lkml.kernel.org/r/304747c602e46f6396e3bb75dfdcb42ae3656dca.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 496082df01bb08a40f9207d918734cf908c5f107)
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>
---
 .../tools/rtla/common_osnoise_description.rst |  8 +++
 Documentation/tools/rtla/rtla-osnoise.rst     | 59 +++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 Documentation/tools/rtla/common_osnoise_description.rst
 create mode 100644 Documentation/tools/rtla/rtla-osnoise.rst

diff --git a/Documentation/tools/rtla/common_osnoise_description.rst b/Documentation/tools/rtla/common_osnoise_description.rst
new file mode 100644
index 000000000000..8973c5df888f
--- /dev/null
+++ b/Documentation/tools/rtla/common_osnoise_description.rst
@@ -0,0 +1,8 @@
+The **rtla osnoise** tool is an interface for the *osnoise* tracer. The
+*osnoise* tracer dispatches a kernel thread per-cpu. These threads read the
+time in a loop while with preemption, softirq and IRQs enabled, thus
+allowing all the sources of operating systme noise during its execution.
+The *osnoise*'s tracer threads take note of the delta between each time
+read, along with an interference counter of all sources of interference.
+At the end of each period, the *osnoise* tracer displays a summary of
+the results.
diff --git a/Documentation/tools/rtla/rtla-osnoise.rst b/Documentation/tools/rtla/rtla-osnoise.rst
new file mode 100644
index 000000000000..c129b206ce34
--- /dev/null
+++ b/Documentation/tools/rtla/rtla-osnoise.rst
@@ -0,0 +1,59 @@
+===============
+rtla-osnoise
+===============
+------------------------------------------------------------------
+Measure the operating system noise
+------------------------------------------------------------------
+
+:Manual section: 1
+
+SYNOPSIS
+========
+**rtla osnoise** [*MODE*] ...
+
+DESCRIPTION
+===========
+
+.. include:: common_osnoise_description.rst
+
+The *osnoise* tracer outputs information in two ways. It periodically prints
+a summary of the noise of the operating system, including the counters of
+the occurrence of the source of interference. It also provides information
+for each noise via the **osnoise:** tracepoints. The **rtla osnoise top**
+mode displays information about the periodic summary from the *osnoise* tracer.
+The **rtla osnoise hist** mode displays information about the noise using
+the **osnoise:** tracepoints. For further details, please refer to the
+respective man page.
+
+MODES
+=====
+**top**
+
+        Prints the summary from osnoise tracer.
+
+**hist**
+
+        Prints a histogram of osnoise samples.
+
+If no MODE is given, the top mode is called, passing the arguments.
+
+OPTIONS
+=======
+
+**-h**, **--help**
+
+        Display the help text.
+
+For other options, see the man page for the corresponding mode.
+
+SEE ALSO
+========
+**rtla-osnoise-top**\(1), **rtla-osnoise-hist**\(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