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authorDaniel Bristot de Oliveira <bristot@kernel.org>2022-12-10 01:05:54 +0300
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-12-10 21:36:05 +0300
commitd358dfe60b7724ad0acb8cf8375a608b983e2b59 (patch)
tree721cb686ce6091bd40f88bd0654e337d932ada0d /Documentation/trace
parentb5dce2002567a9b1a83ef3e3a8678d8c32be2a78 (diff)
downloadlinux-d358dfe60b7724ad0acb8cf8375a608b983e2b59.tar.xz
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>
Diffstat (limited to 'Documentation/trace')
-rw-r--r--Documentation/trace/osnoise-tracer.rst20
1 files 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
------------------