Provided by: trace-cmd_1.0.3-0ubuntu2_i386 bug


       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), trace-cmd-listen(1)


       Written by Steven Rostedt, <[1]>




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



                                  12/03/2011              TRACE-CMD-EXTRACT(1)