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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD-RESTORE(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd-restore -
   restore a failed trace record
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd restore</strong> [<em>OPTIONS</em>] [<em>command</em>] cpu-file [cpu-file …]</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) restore command will restore a crashed trace-cmd-record(1)
file. If for some reason a trace-cmd record fails, it will leave a the
per-cpu data files and not create the final trace.dat file. The trace-cmd
restore will append the files to create a working trace.dat file that can
be read with trace-cmd-report(1).</p></div>
<div class="paragraph"><p>When trace-cmd record runs, it spawns off a process per CPU and writes
to a per cpu file usually called <em>trace.dat.cpuX</em>, where X represents the
CPU number that it is tracing. If the -o option was used in the trace-cmd
record, then the CPU data files will have that name instead of the
<em>trace.dat</em> name. If a unexpected crash occurs before the tracing
is finished, then the per CPU files will still exist but there will
not be any trace.dat file to read from. trace-cmd restore will allow you
to create a trace.dat file with the existing data files.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-c</strong>
</dt>
<dd>
<p>
    Create a partial trace.dat file from the machine, to be used with
    a full trace-cmd restore at another time. This option is useful for
    embedded devices. If a server contains the cpu files of a crashed
    trace-cmd record (or trace-cmd listen), trace-cmd restore can be
    executed on the embedded device with the -c option to get all the
    stored information of that embedded device. Then the file created
    could be copied to the server to run the trace-cmd restore there
    with the cpu files.
</p>
<div class="literalblock">
<div class="content">
<pre><code>If *-o* is not specified, then the file created will be called
'trace-partial.dat'. This is because the file is not a full version
of something that trace-cmd-report(1) could use.</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
<strong>-t</strong> tracing_dir
</dt>
<dd>
<p>
    Used with <strong>-c</strong>, it overrides the location to read the events from.
    By default, tracing information is read from the debugfs/tracing
    directory. <strong>-t</strong> will use that location instead. This can be useful
    if the trace.dat file to create is from another machine.
    Just tar -cvf events.tar debugfs/tracing and copy and untar that
    file locally, and use that directory instead.
</p>
</dd>
<dt class="hdlist1">
<strong>-k</strong> kallsyms
</dt>
<dd>
<p>
    Used with <strong>-c</strong>, it overrides where to read the kallsyms file from.
    By default, /proc/kallsyms is used. <strong>-k</strong> will override the file to
    read the kallsyms from. This can be useful if the trace.dat file
    to create is from another machine. Just copy the /proc/kallsyms
    file locally, and use <strong>-k</strong> to point to that file.
</p>
</dd>
<dt class="hdlist1">
<strong>-o</strong> output'
</dt>
<dd>
<p>
    By default, trace-cmd restore will create a <em>trace.dat</em> file
    (or <em>trace-partial.dat</em> if <strong>-c</strong> is specified). You can
    specify a different file to write to with the <strong>-o</strong> option.
</p>
</dd>
<dt class="hdlist1">
<strong>-i</strong> input
</dt>
<dd>
<p>
    By default, trace-cmd restore will read the information of the
    current system to create the initial data stored in the <em>trace.dat</em>
    file. If the crash was on another machine, then that machine should
    have the trace-cmd restore run with the <strong>-c</strong> option to create the
    trace.dat partial file. Then that file can be copied to the current
    machine where trace-cmd restore will use <strong>-i</strong> to load that file
    instead of reading from the current system.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="paragraph"><p>If a crash happened on another box, you could run:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>$ trace-cmd restore -c -o box-partial.dat</code></pre>
</div></div>
<div class="paragraph"><p>Then on the server that has the cpu files:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>$ trace-cmd restore -i box-partial.dat trace.dat.cpu0 trace.dat.cpu1</code></pre>
</div></div>
<div class="paragraph"><p>This would create a trace.dat file for the embedded box.</p></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-extract(1), trace-cmd-reset(1), trace-cmd-split(1),
trace-cmd-list(1), trace-cmd-listen(1)</p></div>
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<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>Written by Steven Rostedt, <<a href="mailto:rostedt@goodmis.org">rostedt@goodmis.org</a>></p></div>
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<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>
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<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>
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<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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