NAME

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

SYNOPSIS

       trace-cmd extract [OPTIONS]

DESCRIPTION

       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.

OPTIONS

       -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.

       -s
           Extract from the snapshot buffer (if the kernel supports it).

       --date
           This is the same as the trace-cmd-record(1) --date option, but it does cause the
           extract routine to disable all tracing. That is, the end of the extract will perform
           something similar to trace-cmd-reset(1).

SEE ALSO

       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)

AUTHOR

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

RESOURCES

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

COPYING

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

NOTES

        1. rostedt@goodmis.org
           mailto:rostedt@goodmis.org

                                            01/29/2014                       TRACE-CMD-EXTRACT(1)