linux-kernel - [PATCH] rtla/osnoise: set the default threshold to 1us

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Date: Mon, 10 Jun 2024 10:23:14 -0300
From: "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Daniel Bristot de Oliveira <bristot@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH] rtla/osnoise: set the default threshold to 1us

Change the default threshold for osnoise to 1us, so that any noise
equal or above this value is recorded. Let the user set a higher
threshold if necessary.

Suggested-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Reviewed-by: Clark Williams <williams@...hat.com>
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@...hat.com>
---
 Documentation/trace/osnoise-tracer.rst | 2 +-
 kernel/trace/trace_osnoise.c           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/trace/osnoise-tracer.rst b/Documentation/trace/osnoise-tracer.rst
index 140ef2533d26a..a520adbd34765 100644
--- a/Documentation/trace/osnoise-tracer.rst
+++ b/Documentation/trace/osnoise-tracer.rst
@@ -108,7 +108,7 @@ The tracer has a set of options inside the osnoise directory, they are:
    option.
  - tracing_threshold: the minimum delta between two time() reads to be
    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 1 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
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index a8e28f9b9271c..66a871553d4a1 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1444,9 +1444,9 @@ static int run_osnoise(void)
 	save_osn_sample_stats(osn_var, &s);
 
 	/*
-	 * if threshold is 0, use the default value of 5 us.
+	 * if threshold is 0, use the default value of 1 us.
 	 */
-	threshold = tracing_thresh ? : 5000;
+	threshold = tracing_thresh ? : 1000;
 
 	/*
 	 * Apply PREEMPT and IRQ disabled options.
-- 
2.45.2