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Message-ID: <20221210135827.094878105@goodmis.org> Date: Sat, 10 Dec 2022 08:58:15 -0500 From: Steven Rostedt <rostedt@...dmis.org> To: linux-kernel@...r.kernel.org Cc: Masami Hiramatsu <mhiramat@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Daniel Bristot de Oliveira <bristot@...nel.org>, Juri Lelli <juri.lelli@...hat.com>, Clark Williams <williams@...hat.com>, Jonathan Corbet <corbet@....net>, Bagas Sanjaya <bagasdotme@...il.com> Subject: [for-next][PATCH 25/25] Documentation/osnoise: Add osnoise/options documentation From: Daniel Bristot de Oliveira <bristot@...nel.org> 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@...nel.org> Cc: Juri Lelli <juri.lelli@...hat.com> Cc: Clark Williams <williams@...hat.com> Cc: Masami Hiramatsu <mhiramat@...nel.org> Cc: Jonathan Corbet <corbet@....net> Cc: Bagas Sanjaya <bagasdotme@...il.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org> Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org> --- Documentation/trace/osnoise-tracer.rst | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/Documentation/trace/osnoise-tracer.rst b/Documentation/trace/osnoise-tracer.rst index fdd562d7c22d..140ef2533d26 100644 --- a/Documentation/trace/osnoise-tracer.rst +++ b/Documentation/trace/osnoise-tracer.rst @@ -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 ------------------ -- 2.35.1
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