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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD-EXTRACT(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd-extract -
   extract out the data from the Ftrace Linux tracer.
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd extract [<em>OPTIONS</em>]</strong></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) extract is usually used after <em>trace-cmd-start(1)</em> and
<em>trace-cmd-stop(1)</em>. It can be used after the Ftrace tracer has been started
manually through the Ftrace pseudo file system.</p></div>
<div class="paragraph"><p>The extract command creates a trace.dat file that can be used by
<em>trace-cmd-report(1)</em> to read from. It reads the kernel internal ring buffer
to produce the trace.dat file.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-p</strong> <em>plugin</em>
</dt>
<dd>
<p>
    Although <strong>extract</strong> 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 <em>wakeup</em>, <em>wakeup-rt</em>,
    <em>irqsoff</em>, <em>preemptoff</em> and <em>preemptirqsoff</em> plugins.
</p>
<div class="literalblock">
<div class="content">
<pre><code>With out this option, the extract command will extract from the internal
Ftrace buffers.</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
<strong>-O</strong> <em>option</em>
</dt>
<dd>
<p>
    If a latency tracer is being extracted, and the <strong>-p</strong> 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
    <em>trace-cmd-list</em>. To enable an option, write its name, to disable the
    option append the characters <em>no</em> to it. For example: <em>noprint-parent</em>
    will disable the <em>print-parent</em> option that prints the parent function in
    printing a function event.
</p>
</dd>
<dt class="hdlist1">
<strong>-o</strong> <em>outputfile</em>
</dt>
<dd>
<p>
    By default, the extract command will create a <em>trace.dat</em> file. This
    option will change where the file is written to.
</p>
</dd>
<dt class="hdlist1">
<strong>-s</strong>
</dt>
<dd>
<p>
    Extract from the snapshot buffer (if the kernel supports it).
</p>
</dd>
<dt class="hdlist1">
<strong>--date</strong>
</dt>
<dd>
<p>
    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).
</p>
</dd>
<dt class="hdlist1">
<strong>-B</strong> <em>buffer-name</em>
</dt>
<dd>
<p>
    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 <strong>-t</strong> is given.
</p>
</dd>
<dt class="hdlist1">
<strong>-a</strong>
</dt>
<dd>
<p>
    Extract all existing buffer instances. When this option is used, the
    top level instance will not be extracted unless <strong>-t</strong> is given.
</p>
</dd>
<dt class="hdlist1">
<strong>-t</strong>
</dt>
<dd>
<p>
    Extracts the top level instance buffer. Without the <strong>-B</strong> or <strong>-a</strong> option
    this is the same as the default. But if <strong>-B</strong> or <strong>-a</strong> is used, this is
    required if the top level instance buffer should also be extracted.
</p>
</dd>
<dt class="hdlist1">
<strong>--verbose</strong>[=<em>level</em>]
</dt>
<dd>
<p>
     Set the log level. Supported log levels are "none", "critical", "error", "warning",
     "info", "debug", "all" or their identifiers "0", "1", "2", "3", "4", "5", "6". Setting the log
     level to specific value enables all logs from that and all previous levels.
     The level will default to "info" if one is not specified.
</p>
<div class="literalblock">
<div class="content">
<pre><code>Example: enable all critical, error and warning logs</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>trace-cmd extract --verbose=warning</code></pre>
</div></div>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p>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)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>Written by Steven Rostedt, &lt;<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>&gt;</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_resources">RESOURCES</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/">https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/</a></p></div>
</div>
</div>
<div class="sect1">
<h2 id="_copying">COPYING</h2>
<div class="sectionbody">
<div class="paragraph"><p>Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under
the terms of the GNU Public License (GPL).</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2023-06-07 20:21:00 UTC
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