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authorSteven Rostedt <rostedt@goodmis.org>2016-07-06 15:25:08 -0400
committerSteven Rostedt <rostedt@goodmis.org>2016-11-15 15:13:59 -0500
commitfa32e8557b470f5ff90babc6cbacc61535a81a0f (patch)
treefa3fdc74436987c4832e2941659efa1b6f22d874 /Documentation/trace
parent9648dc15772d77b5431cd5c11675d90eee1a4c2f (diff)
downloadop-kernel-dev-fa32e8557b470f5ff90babc6cbacc61535a81a0f.zip
op-kernel-dev-fa32e8557b470f5ff90babc6cbacc61535a81a0f.tar.gz
tracing: Add new trace_marker_raw
A new file is created: /sys/kernel/debug/tracing/trace_marker_raw This allows for appications to create data structures and write the binary data directly into it, and then read the trace data out from trace_pipe_raw into the same type of data structure. This saves on converting numbers into ASCII that would be required by trace_marker. Suggested-by: Olof Johansson <olof@lixom.net> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
-rw-r--r--Documentation/trace/ftrace.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 1bc66c1..6c374c5 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -396,6 +396,12 @@ of ftrace. Here is a list of some of the key files:
trace_fd = open("trace_marker", WR_ONLY);
+ trace_marker_raw:
+
+ This is similar to trace_marker above, but is meant for for binary data
+ to be written to it, where a tool can be used to parse the data
+ from trace_pipe_raw.
+
uprobe_events:
Add dynamic tracepoints in programs.
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