trace-cmd-extract(1)

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).

   -B buffer-name
       If the kernel supports multiple buffers, this will extract the
       trace for only the given buffer. It does not affect any other
       buffer. This may be used multiple times to specify different
       buffers. When this option is used, the top level instance will not
       be extracted unless -t is given.

   -a
       Extract all existing buffer instances. When this option is used,
       the top level instance will not be extracted unless -t is given.

   -t
       Extracts the top level instance buffer. Without the -B or -a option
       this is the same as the default. But if -B or -a is used, this is
       required if the top level instance buffer should also be extracted.

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, <[email protected][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. [email protected]
       mailto:[email protected]

                              07/17/2016              TRACE-CMD-EXTRACT(1)

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