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<body class="manpage">
<div id="header">
<h1>
TRACE-CMD-ATTACH(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>trace-cmd-attach -
   attach a guest trace.dat file to a host trace.dat file
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph"><p><strong>trace-cmd attach</strong> [<em>OPTIONS</em>] host-trace-file guest-trace-file guest-pid [guest-pid &#8230;]</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>The trace-cmd(1) attach is used to take a trace.dat file created on a guest and
attach it to a trace.dat file that was created on the host. In most cases,
trace-cmd-agent(1) can be used to automate this, but if for some reason, the
agent isn&#8217;t appropriate, it may be required to start trace-cmd recording on
the guest with trace-cmd-record(1). If the host recording is activated at the
same time, one can use trace-cmd attach(1) to connect the guest and host files
as if they were created by the trace-cmd agent.</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>host-trace-file</strong>
</dt>
<dd>
<p>
    The trace.dat file created by the host. Must have kvm_exit and kvm_entry
    events, and use the "tsc2nsec" clock.
</p>
</dd>
<dt class="hdlist1">
<strong>guest-trace-file</strong>
</dt>
<dd>
<p>
    The trace.dat file created by the guest. Must use the "x86-tsc" clock.
    For now, this is only supported on x86, it may support other achitectures
    later.
</p>
</dd>
<dt class="hdlist1">
<strong>guest-pid</strong>
</dt>
<dd>
<p>
    The process ID of the host thread that represents the guests threads.
    Each process ID that represents all of the guest vCPUs should be listed.
    Note, you can add more than just the threads that represent the guest
    vCPUs, as the tool will search the <strong>host-trace-file</strong> for kvm_exit and
    kvm_entry events to match these PIDs with the vCPUs that they represent.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<strong>-c</strong> <em>cpus</em>
</dt>
<dd>
<p>
    Specify a the number of CPUS the guest has.
</p>
</dd>
<dt class="hdlist1">
<strong>-s</strong> <em>timeshift</em>
</dt>
<dd>
<p>
    A comma separated list of the format <em>offset</em>,<em>scale</em>,<em>frac</em>,<em>timestamp</em>
    These values map to what are given in /sys/kernel/kvm/&lt;pid&gt;/vcpu/*
</p>
<div class="literalblock">
<div class="content">
<pre><code>*offset*: Is the offset of the guest. "tsc-offest" in the directory. Note
          that the value listed here is the negative of what is listed in
          the directory.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>*scale*:  The scaling factor. "tsc-scaling-ratio"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>*frac*:   The fraction bits. "tsc-scaling-ratio-frac-bits"</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>*timestamp*: The timestamp to start using the above. In some cases, the
          values may change over time. By adding a timestamp, it will
          take effect after the timestamp has been hit. Normally
          this would be zero.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Currently, only one timeshift is given per CPU. One *-s* option should be
given for each CPU. If there are less options than CPUs, then the last option
given will be used for the rest of the CPUs. If only one option is given, then
the values for that option will be used for all CPUs.</code></pre>
</div></div>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="paragraph"><p>Enable all events for tracing:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>  $ <span style="font-style: italic"><span style="color: #9A1900"># find the process for a given guest</span></span>
  $ ps aux <span style="color: #990000">|</span>grep qemu
 libvirt<span style="color: #990000">+</span>   <span style="color: #993399">63170</span>  <span style="color: #993399">5.6</span>  <span style="color: #993399">1.6</span> <span style="color: #993399">13994848</span> <span style="color: #993399">4257540</span> <span style="color: #990000">?</span>    Sl   May02 <span style="color: #993399">2884</span><span style="color: #990000">:</span><span style="color: #993399">49</span> /usr/bin/qemu-system-x86_64<span style="color: #990000">...</span>

  $ <span style="font-style: italic"><span style="color: #9A1900"># Use 63170 to find all the PIDs for the give guest</span></span>
  $ ls /proc<span style="color: #990000">/</span><span style="color: #993399">63170</span>/task
 <span style="color: #993399">1541591</span>  <span style="color: #993399">63170</span>  <span style="color: #993399">63198</span>  <span style="color: #993399">63209</span>  <span style="color: #993399">63211</span>  <span style="color: #993399">63213</span>  <span style="color: #993399">63214</span>  <span style="color: #993399">63215</span>  <span style="color: #993399">63216</span>  <span style="color: #993399">63217</span>  <span style="color: #993399">63218</span>  <span style="color: #993399">63219</span>  <span style="color: #993399">63234</span>

  $ <span style="font-style: italic"><span style="color: #9A1900"># Find the tsc offset</span></span>
  $ su
  <span style="font-style: italic"><span style="color: #9A1900"># cat /sys/kernel/debug/kvm/63170-15/vcpu0/tsc-offset</span></span>
 -<span style="color: #993399">27950965013436847</span>

  <span style="font-style: italic"><span style="color: #9A1900"># trace-cmd record -C tsc2nesc -e kvm -e sched -e irq -e timer</span></span>

<span style="font-style: italic"><span style="color: #9A1900"># on guest:</span></span>

  <span style="font-style: italic"><span style="color: #9A1900"># trace-cmd record -C x86-tsc -e sched -e irq -e timer sleep 10</span></span>

<span style="font-style: italic"><span style="color: #9A1900"># back on host, hit Ctrl^C to stop tracing after the guest is done</span></span>

  <span style="font-style: italic"><span style="color: #9A1900"># # Make the trace.dat user owned by your user account.</span></span>
  <span style="font-style: italic"><span style="color: #9A1900"># chown user.user trace.dat</span></span>
  <span style="font-style: italic"><span style="color: #9A1900"># exit</span></span>

  $ scp root@guest<span style="color: #990000">:</span>trace<span style="color: #990000">.</span>dat trace-guest<span style="color: #990000">.</span>dat

  $ <span style="font-style: italic"><span style="color: #9A1900"># now attach the two files (guest has 8 CPUs)</span></span>
  $ trace-cmd attach -c <span style="color: #993399">8</span> -s <span style="color: #993399">27950965013436847</span> trace<span style="color: #990000">.</span>dat trace-guest<span style="color: #990000">.</span>dat <span style="color: #993399">1541591</span>  <span style="color: #993399">63170</span>  <span style="color: #993399">63198</span>  <span style="color: #993399">63209</span>  <span style="color: #993399">63211</span>  <span style="color: #993399">63213</span>  <span style="color: #993399">63214</span>  <span style="color: #993399">63215</span>  <span style="color: #993399">63216</span>  <span style="color: #993399">63217</span>  <span style="color: #993399">63218</span>  <span style="color: #993399">63219</span>  <span style="color: #993399">63234</span>

  $ trace-cmd report -i trace<span style="color: #990000">.</span>dat -i trace-guest<span style="color: #990000">.</span>dat
  $ <span style="font-style: italic"><span style="color: #9A1900"># now you should see the guest trace interleaved within the host trace.</span></span></tt></pre></div></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-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), trace-cmd-profile(1)</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_author">AUTHOR</h2>
<div class="sectionbody">
<div class="paragraph"><p>Written by Steven Rostedt (Google) &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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</div>
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Zerion Mini Shell 1.0