From 4c86bc531e60900053384867c082675bba82c29f Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Thu, 16 Jan 2025 09:33:35 -0500
Subject: tracing: Add :mod: command to enabled module events

Add a :mod: command to enable only events from a given module from the
set_events file.

  echo '*:mod:<module>' > set_events

Or

  echo ':mod:<module>' > set_events

Will enable all events for that module. Specific events can also be
enabled via:

  echo '<event>:mod:<module>' > set_events

Or

  echo '<system>:<event>:mod:<module>' > set_events

Or

  echo '*:<event>:mod:<module>' > set_events

The ":mod:" keyword is consistent with the function tracing filter to
enable functions from a given module.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/20250116143533.214496360@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 kernel/trace/trace.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'kernel/trace/trace.c')

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5aeb898054e7..cb85ee4a8807 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5514,6 +5514,8 @@ static const char readme_msg[] =
 	"\t    efield: For event probes ('e' types), the field is on of the fields\n"
 	"\t            of the <attached-group>/<attached-event>.\n"
 #endif
+	"  set_event\t\t- Enables events by name written into it\n"
+	"\t\t\t  Can enable module events via: :mod:<module>\n"
 	"  events/\t\t- Directory containing all trace event subsystems:\n"
 	"      enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
 	"  events/<system>/\t- Directory containing all trace events for <system>:\n"
-- 
cgit v1.2.3-59-g8ed1b