From d3439f9d6c1a5316ba66397408a275f0601f69aa Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" Date: Fri, 11 May 2018 15:41:24 -0400 Subject: tracing: Document trace_marker triggers Add documentation and an example on how to use trace_marker triggers. Reviewed-by: Tom Zanussi Reviewed-by: Namhyung Kim Signed-off-by: Steven Rostedt (VMware) --- Documentation/trace/ftrace.rst | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'Documentation/trace/ftrace.rst') diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index 67d9c38e95eb..aad4776c0f5d 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -507,6 +507,11 @@ of ftrace. Here is a list of some of the key files: trace_fd = open("trace_marker", WR_ONLY); + Note: Writing into the trace_marker file can also initiate triggers + that are written into /sys/kernel/tracing/events/ftrace/print/trigger + See "Event triggers" in Documentation/trace/events.rst and an + example in Documentation/trace/histogram.rst (Section 3.) + trace_marker_raw: This is similar to trace_marker above, but is meant for for binary data -- cgit v1.2.3-70-g09d2