Documentation/tools/rtla/rtla-osnoise-top.rst

Source file repositories/reference/linux-study-clean/Documentation/tools/rtla/rtla-osnoise-top.rst

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Documentation/tools/rtla/rtla-osnoise-top.rst
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Support Tooling And Documentation: documentation
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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.. |tool| replace:: osnoise top

===================
rtla-osnoise-top
===================
-----------------------------------------------
Display a summary of the operating system noise
-----------------------------------------------

:Manual section: 1

SYNOPSIS
========
**rtla osnoise top** [*OPTIONS*]

DESCRIPTION
===========
.. include:: common_osnoise_description.txt

**rtla osnoise top** collects the periodic summary from the *osnoise* tracer,
including the counters of the occurrence of the interference source,
displaying the results in a user-friendly format.

The tool also allows many configurations of the *osnoise* tracer and the
collection of the tracer output.

OPTIONS
=======
.. include:: common_osnoise_options.txt

.. include:: common_top_options.txt

.. include:: common_options.txt

EXAMPLE
=======
In the example below, the **rtla osnoise top** tool is set to run with a
real-time priority *FIFO:1*, on CPUs *0-3*, 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* and to display
a summary of the report at the end of the session::

  [root@f34 ~]# rtla osnoise top -P F:1 -c 0-3 -r 900000 -d 1M -q
                                          Operating System Noise
  duration:   0 00:01:00 | time is in us
  CPU Period       Runtime        Noise  % CPU Aval   Max Noise   Max Single          HW          NMI          IRQ      Softirq       Thread
    0 #59         53100000       304896    99.42580        6978           56         549            0        53111         1590           13
    1 #59         53100000       338339    99.36282        8092           24         399            0        53130         1448           31
    2 #59         53100000       290842    99.45227        6582           39         855            0        53110         1406           12
    3 #59         53100000       204935    99.61405        6251           33         290            0        53156         1460           12

SEE ALSO
========

**rtla-osnoise**\(1), **rtla-osnoise-hist**\(1)

`Osnoise tracer <https://docs.kernel.org/trace/osnoise-tracer.html>`__

AUTHOR
======
Written by Daniel Bristot de Oliveira <bristot@kernel.org>

.. include:: common_appendix.txt

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Implementation Notes