diff options
| author | Daniel Bristot de Oliveira | 2021-12-10 19:11:28 +0100 |
|---|---|---|
| committer | Steven Rostedt | 2022-01-13 17:02:43 -0500 |
| commit | 496082df01bb08a40f9207d918734cf908c5f107 (patch) | |
| tree | dc422335631337652f4ea8276ed7edd235728e1a /Documentation/tools | |
| parent | d40d48e1f1f25abe755521e33a67f5d2b8b9443c (diff) | |
rtla: Add rtla osnoise man page
Man page for rtla osnoise command.
Link: https://lkml.kernel.org/r/304747c602e46f6396e3bb75dfdcb42ae3656dca.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>
Diffstat (limited to 'Documentation/tools')
| -rw-r--r-- | Documentation/tools/rtla/common_osnoise_description.rst | 8 | ||||
| -rw-r--r-- | Documentation/tools/rtla/rtla-osnoise.rst | 59 |
2 files changed, 67 insertions, 0 deletions
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@kernel.org> + +.. include:: common_appendix.rst |