Commit 8a815e6b authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

tracing: Have the document reflect that the trace file keeps tracing enabled 

Now that reading the trace file does not temporarly stop tracing while it is
open, update the document to reflect this fact.

Link: http://lkml.kernel.org/r/20200317213417.209675068@goodmis.org



Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent c9b7a4a7

Documentation/trace/ftrace.rst

+7 −6
Original line number Diff line number Diff line
@@ -125,10 +125,13 @@ of ftrace. Here is a list of some of the key files: 
  trace:



	This file holds the output of the trace in a human

	readable format (described below). Note, tracing is temporarily

	disabled when the file is open for reading. Once all readers

	are closed, tracing is re-enabled. Opening this file for

	readable format (described below). Opening this file for

	writing with the O_TRUNC flag clears the ring buffer content.

        Note, this file is not a consumer. If tracing is off

        (no tracer running, or tracing_on is zero), it will produce

        the same output each time it is read. When tracing is on,

        it may produce inconsistent results as it tries to read

        the entire buffer without consuming it.



  trace_pipe:
@@ -142,9 +145,7 @@ of ftrace. Here is a list of some of the key files: 
	will not be read again with a sequential read. The

	"trace" file is static, and if the tracer is not

	adding more data, it will display the same

	information every time it is read. Unlike the

	"trace" file, opening this file for reading will not

	temporarily disable tracing.

	information every time it is read.



  trace_options:

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