[PATCH 1/2] docs: tracing: Add stacktrace filter command

[Masami Hiramatsu]

Add a description of stacktrace filter command.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
---
 Documentation/trace/ftrace.rst |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index a20d34955333..81378a8b631e 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -2987,6 +2987,9 @@ The following commands are supported:
   command, it only prints out the contents of the ring buffer for the
   CPU that executed the function that triggered the dump.
 
+- stacktrace:
+  When the function is hit, a stack trace is recorded.
+
 trace_pipe
 ----------