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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD-SNAPSHOT(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd-snapshot -
   take, reset, free, or show a Ftrace kernel snapshot
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd snapshot</strong> [<em>OPTIONS</em>]</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel
snapshot feature (if the kernel supports it). This is useful to "freeze"
an instance of a live trace but without stopping the trace.</p></div>
<div class="literalblock">
<div class="content">
<pre><code> trace-cmd start -p function
 trace-cmd snapshot -s
 trace-cmd snapshot
[ dumps the content of buffer at 'trace-cmd snapshot -s' ]
 trace-cmd snapshot -s
 trace-cmd snapshot
[ dumps the new content of the buffer at the last -s operation ]</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-s</strong>
</dt>
<dd>
<p>
    Take a snapshot of the currently running buffer.
</p>
</dd>
<dt class="hdlist1">
<strong>-r</strong>
</dt>
<dd>
<p>
    Clear out the buffer.
</p>
</dd>
<dt class="hdlist1">
<strong>-f</strong>
</dt>
<dd>
<p>
    Free the snapshot buffer. The buffer takes up memory inside the
    kernel. It is best to free it when not in use. The first -s
    operation will allocate it if it is not already allocated.
</p>
</dd>
<dt class="hdlist1">
<strong>-c</strong> <em>cpu</em>
</dt>
<dd>
<p>
    Operate on a per cpu snapshot (may not be fully supported by all kernels)
</p>
</dd>
<dt class="hdlist1">
<strong>-B</strong> <em>buf</em>
</dt>
<dd>
<p>
    If a buffer instance was created, then the <strong>-B</strong> option will operate on
    the snapshot within the buffer.
</p>
</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-extract(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
</div>
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