Measure the operating system noise¶
- Manual section
rtla osnoise [MODE] ...
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 system 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.
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.
Prints the summary from osnoise tracer.
Prints a histogram of osnoise samples.
If no MODE is given, the top mode is called, passing the arguments.
Display the help text.
For other options, see the man page for the corresponding mode.
Osnoise tracer documentation: <https://www.kernel.org/doc/html/latest/trace/osnoise-tracer.html>
rtla is Free Software licensed under the GNU GPLv2
Copyright (C) 2021 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).