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