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CentOS 7.0 - man page for trace-cmd-extract (centos section 1)

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       trace-cmd-extract - extract out the data from the Ftrace Linux tracer.

       trace-cmd extract [OPTIONS]

       The trace-cmd(1) extract is usually used after trace-cmd-start(1) and trace-cmd-stop(1).
       It can be used after the Ftrace tracer has been started manually through the Ftrace pseudo
       file system.

       The extract command creates a trace.dat file that can be used by trace-cmd-report(1) to
       read from. It reads the kernel internal ring buffer to produce the trace.dat file.

       -p plugin
	   Although extract does not start any traces, some of the plugins require just reading
	   the output in ASCII format. These are the latency tracers, since the latency tracers
	   have a separate internal buffer. The plugin option is therefore only necessary for the
	   wakeup, wakeup-rt, irqsoff, preemptoff and preemptirqsoff plugins.

	       With out this option, the extract command will extract from the internal
	       Ftrace buffers.

       -O option
	   If a latency tracer is being extracted, and the -p option is used, then there are some
	   Ftrace options that can change the format. This will update those options before
	   extracting. To see the list of options see trace-cmd-list. To enable an option, write
	   its name, to disable the option append the characters no to it. For example:
	   noprint-parent will disable the print-parent option that prints the parent function in
	   printing a function event.

       -o outputfile
	   By default, the extract command will create a trace.dat file. This option will change
	   where the file is written to.

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1),
       trace-cmd-stop(1), trace-cmd-reset(1), trace-cmd-split(1), trace-cmd-list(1),

       Written by Steven Rostedt, <rostedt@goodmis.org[1]>


       Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of
       the GNU Public License (GPL).

	1. rostedt@goodmis.org

					    06/11/2014			     TRACE-CMD-EXTRACT(1)
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