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<section id="geopm-cpuinfoiogroup-3-iogroup-for-cpu-frequency-limits">
<h1>geopm::CpuinfoIOGroup(3) – IOGroup for CPU frequency limits<a class="headerlink" href="#geopm-cpuinfoiogroup-3-iogroup-for-cpu-frequency-limits" title="Permalink to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">CpuinfoIOGroup</span></code> class and the <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> class are members of
the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but the full names, <code class="docutils literal notranslate"><span class="pre">geopm::CpuinfoIOGroup</span></code> and
<code class="docutils literal notranslate"><span class="pre">geopm::IOGroup</span></code>, have been abbreviated in this manual.
Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::pair</span></code>, <code class="docutils literal notranslate"><span class="pre">std::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::map</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable
better rendering of this manual.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/service/src/CpuinfoIOGroup.hpp"><geopm/CpuinfoIOGroup.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopmd</span></code></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="n">set</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">signal_names</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">set</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">control_names</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">bool</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::is_valid_signal</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">bool</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::is_valid_control</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::signal_domain_type</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::control_domain_type</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::push_signal</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::push_control</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">control_name</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::read_batch</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::write_batch</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">double</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::sample</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">batch_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::adjust</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">batch_idx</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">setting</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">double</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::read_signal</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::write_control</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">control_name</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_type</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">domain_idx</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="n">setting</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::save_control</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::restore_control</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">function</span><span class="o"><</span><span class="kt">double</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">double</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">agg_function</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">function</span><span class="o"><</span><span class="n">string</span><span class="p">(</span><span class="kt">double</span><span class="p">)</span><span class="o">></span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">format_function</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">string</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::signal_description</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="n">string</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::control_description</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">control_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::signal_behavior</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">signal_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::save_control</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">save_path</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CpuinfoIOGroup::restore_control</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">save_path</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="p">;</span>
<span class="k">static</span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="nf">plugin_name</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">IOGroup</span><span class="o">></span><span class="w"> </span><span class="n">CpuinfoIOGroup</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">CpuinfoIOGroup</span></code> provides constants for CPU frequency limits as
signals. These values are obtained through the <a class="reference external" href="https://man7.org/linux/man-pages/man5/proc.5.html">proc(5)</a> filesystem.</p>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">signal_names()</span></code>:
Returns the list of signal names provided by this IOGroup.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">control_names()</span></code>:
Does nothing; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">is_valid_signal()</span></code>:
Returns whether the given <em>signal_name</em> is supported by the
<code class="docutils literal notranslate"><span class="pre">CpuinfoIOGroup</span></code> for the current platform.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">is_valid_control()</span></code>:
Returns false; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">signal_domain_type()</span></code>:
If the <em>signal_name</em> is valid for this IOGroup, returns <code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_BOARD</span></code>.
All constants provided by the <code class="docutils literal notranslate"><span class="pre">CpuinfoIOGroup</span></code> are assumed to be the same for the whole board.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">control_domain_type()</span></code>:
Returns <code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_INVALID</span></code>; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">push_signal()</span></code>:
Adds the signal specified by <em>signal_name</em> to the list of signals
to be read during <code class="docutils literal notranslate"><span class="pre">read_batch()</span></code>. If <em>domain_type</em> is not
<code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_BOARD</span></code>, throws an error. The <em>domain_idx</em> is ignored.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">push_control()</span></code>:
Should not be called; this IOGroup does not provide any controls.
throws an error</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">read_batch()</span></code>:
Does nothing; this IOGroup’s signals are constant.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">write_batch()</span></code>:
Does nothing; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">sample()</span></code>:
Returns the value of the signal specified by a <em>signal_idx</em>
returned from <code class="docutils literal notranslate"><span class="pre">push_signal()</span></code>. The value will have been updated by
the most recent call to <code class="docutils literal notranslate"><span class="pre">read_batch()</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">adjust()</span></code>:
Should not be called; this IOGroup does not provide any controls.
throws an error</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">read_signal()</span></code>:
Immediately return the stored value for the given <em>signal_name</em>.
If <em>domain_type</em> is not <code class="docutils literal notranslate"><span class="pre">GEOPM_DOMAIN_BOARD</span></code>, throws an error. The <em>domain_idx</em>
is ignored.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">write_control()</span></code>:
Should not be called; this IOGroup does not provide any controls.
throws an error</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">save_control()</span></code>:
Does nothing; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">restore_control()</span></code>:
Does nothing; this IOGroup does not provide any controls.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">agg_function()</span></code>:
For all valid signals in this IOGroup, the aggregation function is
<code class="docutils literal notranslate"><span class="pre">expect_same()</span></code>, described in <a class="reference internal" href="GEOPM_CXX_MAN_Agg.3.html"><span class="doc">geopm::Agg(3)</span></a>. If any frequency
range constants are compared between nodes, they should be the
same or the runtime may behave unpredictably.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">format_function()</span></code>:
Return a function that should be used when formatting the given
signal. For more information see <a class="reference internal" href="GEOPM_CXX_MAN_Agg.3.html"><span class="doc">geopm::Agg(3)</span></a>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">signal_description()</span></code>:
Returns a string description for <em>signal_name</em>, if defined.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">control_description()</span></code>:
Does nothing; this IOGroup does not provide any controls.
Returns an empty string.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">signal_behavior()</span></code>:
Returns one of the <code class="docutils literal notranslate"><span class="pre">IOGroup::signal_behavior_e</span></code> values which
describes about how a signal will change as a function of time.
This can be used when generating reports to decide how to
summarize a signal’s value for the entire application run.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code>:
Returns the name of the plugin to use when this plugin is
registered with the IOGroup factory; see
<a class="reference internal" href="GEOPM_CXX_MAN_PluginFactory.3.html"><span class="doc">geopm::PluginFactory(3)</span></a> for more details.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code>:
Returns a pointer to a new CpuinfoIOGroup object; see
<a class="reference internal" href="GEOPM_CXX_MAN_PluginFactory.3.html"><span class="doc">geopm::PluginFactory(3)</span></a> for more details.</p></li>
</ul>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>,
<a class="reference external" href="https://man7.org/linux/man-pages/man5/proc.5.html">proc(5)</a>,
<a class="reference internal" href="GEOPM_CXX_MAN_IOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a></p>
</section>
</section>
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