rtla/osnoise: set the default threshold to 1us

JIRA: https://issues.redhat.com/browse/RHEL-50869

Conflicts:
	Documentation/trace/osnoise-tracer.rst

commit c40583e
Author: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Date:   Mon Jun 10 10:23:14 2024 -0300

    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.

    Link: https://lore.kernel.org/linux-trace-kernel/Zmb-QhiiiI6jM9To@uudg.org

    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Suggested-by: Daniel Bristot de Oliveira <bristot@kernel.org>
    Reviewed-by: Clark Williams <williams@redhat.com>
    Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
    Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>

Author: lclaudio

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
-   will be used, which is currently 5 us.
+   be used, which is currently 1 us.
 
 Additional Tracing
 ------------------

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.