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Documentation/osnoise: Add osnoise/options documentation 

Add the documentation about the osnoise/options file, the options,
and some additional explanation about the OSNOISE_WORKLOAD option.

Link: https://lkml.kernel.org/r/fde5567a4bae364f67fd1e9a644d1d62862618a6.1670623111.git.bristot@kernel.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2022-12-09 23:05:54 +01:00 committed by Steven Rostedt (Google)
parent b5dce20025
commit d358dfe60b
1 changed files with 18 additions and 2 deletions
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20
Documentation/trace/osnoise-tracer.rst
View File

@ -92,8 +92,8 @@ Note that the example above shows a high number of HW noise samples.
The reason being is that this sample was taken on a virtual machine,
and the host interference is detected as a hardware interference.
Tracer options
---------------------
Tracer Configuration
--------------------
The tracer has a set of options inside the osnoise directory, they are:
@ -115,6 +115,22 @@ The tracer has a set of options inside the osnoise directory, they are:
NO_OSNOISE_WORKLOAD disables the OSNOISE_WORKLOAD option. The
special DEAFAULTS option resets all options to the default value.
Tracer Options
--------------
The osnoise/options file exposes a set of on/off configuration options for
the osnoise tracer. These options are:
- DEFAULTS: reset the options to the default value.
- OSNOISE_WORKLOAD: do not dispatch osnoise workload (see dedicated
section below).
- PANIC_ON_STOP: call panic() if the tracer stops. This option serves to
capture a vmcore.
- OSNOISE_PREEMPT_DISABLE: disable preemption while running the osnoise
workload, allowing only IRQ and hardware-related noise.
- OSNOISE_IRQ_DISABLE: disable IRQs while running the osnoise workload,
allowing only NMIs and hardware-related noise, like hwlat tracer.
Additional Tracing
------------------