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Documentation/osnoise: Add osnoise/options documentation

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Add the documentation about the osnoise/options file, along
with an explanation about the OSNOISE_WORKLOAD option.

Link: https://lkml.kernel.org/r/777af8f3d87beedd304805f98eff6c8291d64226.1668692096.git.bristot@kernel.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-11-17 14:46:20 +01:00 committed by Steven Rostedt (Google)
parent 30838fcd81
commit 67543cd6b8
1 changed files with 12 additions and 0 deletions
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12
Documentation/trace/osnoise-tracer.rst
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@ -109,6 +109,11 @@ The tracer has a set of options inside the osnoise directory, they are:
- tracing_threshold: the minimum delta between two time() reads to be - tracing_threshold: the minimum delta between two time() reads to be
considered as noise, in us. When set to 0, the default value will considered as noise, in us. When set to 0, the default value will
be used, which is currently 5 us. be used, which is currently 5 us.
- osnoise/options: a set of on/off options that can be enabled by
writing the option name to the file or disabled by writing the option
name preceded with the 'NO_' prefix. For example, writing
NO_OSNOISE_WORKLOAD disables the OSNOISE_WORKLOAD option. The
special DEAFAULTS option resets all options to the default value.
Additional Tracing Additional Tracing
------------------ ------------------
@ -150,3 +155,10 @@ tracepoints is smaller than eight us reported in the sample_threshold.
The reason roots in the overhead of the entry and exit code that happens The reason roots in the overhead of the entry and exit code that happens
before and after any interference execution. This justifies the dual before and after any interference execution. This justifies the dual
approach: measuring thread and tracing. approach: measuring thread and tracing.
Running osnoise tracer without workload
---------------------------------------
By enabling the osnoise tracer with the NO_OSNOISE_WORKLOAD option set,
the osnoise: tracepoints serve to measure the execution time of
any type of Linux task, free from the interference of other tasks.