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<section id="geopm-msriogroup-iogroup-providing-msr-based-signals-and-controls">
<h1>geopm::MSRIOGroup – IOGroup providing MSR-based signals and controls<a class="headerlink" href="#geopm-msriogroup-iogroup-providing-msr-based-signals-and-controls" title="Permalink to this heading"></a></h1>
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<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/geopm/MSRIOGroup.hpp"><geopm/MSRIOGroup.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">MSRIOGroup</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">MSRIOGroup</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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::sample</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">sample_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">MSRIOGroup::adjust</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">control_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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup</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">MSRIOGroup</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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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">MSRIOGroup::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="n">string</span><span class="w"> </span><span class="nf">MSRIOGroup::name</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">void</span><span class="w"> </span><span class="nf">MSRIOGroup::parse_json_msrs</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">str</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="nf">MSRIOGroup::msr_allowlist</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">cpuid</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">MSRIOGroup::cpuid</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">string</span><span class="w"> </span><span class="nf">MSRIOGroup::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">MSRIOGroup</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 MSRIOGroup implements the <a class="reference internal" href="GEOPM_CXX_MAN_IOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a> interface to
provide hardware signals and controls using MSRs on Intel platforms.
It relies on <a class="reference internal" href="geopm_pio_msr.7.html"><span class="doc">geopm_pio_msr(7)</span></a> and <a class="reference internal" href="GEOPM_CXX_MAN_MSRIO.3.html"><span class="doc">geopm::MSRIO(3)</span></a>.</p>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Permalink to this heading"></a></h2>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">signal_names()</span></code></dt><dd><p>Returns the list of signal names provided by this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>. This
includes aliases for common hardware-based signals such as
<code class="docutils literal notranslate"><span class="pre">CPU_FREQUENCY_STATUS</span></code>, as well as the supported MSRs for the current platform.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_names()</span></code></dt><dd><p>Returns the list of control names provided by this <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>. This
includes aliases for common hardware-based controls such as
<code class="docutils literal notranslate"><span class="pre">CPU_FREQUENCY_MAX_CONTROL</span></code>, as well as the supported MSRs for the current platform.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">is_valid_signal()</span></code></dt><dd><p>Returns whether the given <em>signal_name</em> is supported by the
<code class="docutils literal notranslate"><span class="pre">MSRIOGroup</span></code> for the current platform. Note that different
platforms may have different supported MSRs.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">is_valid_control()</span></code></dt><dd><p>Returns whether the given <em>control_name</em> is supported by the
<code class="docutils literal notranslate"><span class="pre">MSRIOGroup</span></code> for the current platform. Note that different
platforms may have different supported MSRs.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_domain_type()</span></code></dt><dd><p>Returns the domain type for the signal specified by
<em>signal_name</em>. The domain for a signal may be different on
different platforms.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_domain_type()</span></code></dt><dd><p>Returns the domain type for the control specified by
<em>control_name</em>. The domain for a control may be different on
different platforms.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">push_signal()</span></code></dt><dd><p>Adds the signal specified by <em>signal_name</em> for <em>domain_type</em> at
index <em>domain_idx</em> to the list of signals to be read during
<code class="docutils literal notranslate"><span class="pre">read_batch()</span></code>. If the domain of a signal spans multiple Linux
logical CPUs, only one CPU from that domain will be read, since
all CPUs from the same domain and index will return the same
value.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">push_control()</span></code></dt><dd><p>Adds the control specified by <em>control_name</em> for <em>domain_type</em> at
index <em>domain_idx</em> to the list of controls to be written during
<code class="docutils literal notranslate"><span class="pre">write_batch()</span></code>. If the domain of a control spans multiple Linux
logical CPUs, values written to that control will be written to
all CPUs in the domain.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">read_batch()</span></code></dt><dd><p>Sets up <a class="reference internal" href="GEOPM_CXX_MAN_MSRIO.3.html"><span class="doc">geopm::MSRIO(3)</span></a> for batch reading if needed, then reads
all pushed signals through the <code class="docutils literal notranslate"><span class="pre">MSRIO::read_batch()</span></code> method.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">write_batch()</span></code></dt><dd><p>Writes all adjusted values through the <a class="reference internal" href="GEOPM_CXX_MAN_MSRIO.3.html"><span class="doc">geopm::MSRIO(3)</span></a>
<code class="docutils literal notranslate"><span class="pre">write_batch()</span></code> method.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">sample()</span></code></dt><dd><p>Returns the value of the signal specified by a <em>sample_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>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">adjust()</span></code></dt><dd><p>Sets the control specified by a <em>control_idx</em> returned from
<code class="docutils literal notranslate"><span class="pre">push_control()</span></code> to the value <em>setting</em>. The value will be written
to the underlying MSR by the next call to <code class="docutils literal notranslate"><span class="pre">write_batch()</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">read_signal()</span></code></dt><dd><p>Immediately read and decode the underlying MSR supporting
<em>signal_name</em> for <em>domain_type</em> at index <em>domain_idx</em> and return
the result in SI units.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">write_control()</span></code></dt><dd><p>Immediately encode the SI unit value <em>setting</em> and write the
correct bits of the MSR supporting <em>control_name</em> for
<em>domain_type</em> at <em>domain_idx</em>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">save_control()</span></code></dt><dd><p>Attempts to read and save the current values of all control MSRs
for the platform. If any control is not able to be read, it will
be skipped.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">restore_control()</span></code></dt><dd><p>Using the values saved by <code class="docutils literal notranslate"><span class="pre">save_control()</span></code>, attempts to write back
the original values of all control MSRs. Any control that is not
able to be written will be skipped.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">agg_function()</span></code></dt><dd><p>Returns the function that should be used to aggregate
<em>signal_name</em>. If one was not previously specified by this class,
the default function is <code class="docutils literal notranslate"><span class="pre">select_first()</span></code> from <a class="reference internal" href="GEOPM_CXX_MAN_Agg.3.html"><span class="doc">geopm::Agg(3)</span></a>.
Throws an exception if the <em>signal_name</em> is not valid.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">format_function()</span></code></dt><dd><p>Returns the function that should be used to format the <em>signal_name</em>.
If the <em>signal_name</em> string ends with a <code class="docutils literal notranslate"><span class="pre">'#'</span></code> character,
the function returned is <code class="docutils literal notranslate"><span class="pre">string_format_raw64()</span></code>.
Throws an exception if the <em>signal_name</em> is not valid or if
the <em>signal_name</em> was not found.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_description()</span></code></dt><dd><p>Returns a string description for <em>signal_name</em>, if defined.
Further descriptions of MSR signals can be found in
<a class="reference external" href="https://software.intel.com/en-us/articles/intel-sdm">The Intel Software Developer’s Manual</a></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">control_description()</span></code></dt><dd><p>Returns a string description for <em>control_name</em>, if defined.
Further descriptions of MSR controls can be found in
<a class="reference external" href="https://software.intel.com/en-us/articles/intel-sdm">The Intel Software Developer’s Manual</a></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">signal_behavior()</span></code></dt><dd><p>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>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">parse_json_msrs()</span></code></dt><dd><p>Parse a JSON string and add any raw MSRs and
fields as available signals and controls.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">name()</span></code></dt><dd><p>Calls <code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code> internally.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">msr_allowlist()</span></code></dt><dd><p>Fill string with the <code class="docutils literal notranslate"><span class="pre">msr-safe</span></code> <code class="docutils literal notranslate"><span class="pre">allowlist</span></code> file contents reflecting
all known MSRs for the current platform, or if <em>cpuid</em> is
provided, for the platform specified by <em>cpuid</em>. Returns a string
formatted to be written to an <code class="docutils literal notranslate"><span class="pre">msr-safe</span></code> <code class="docutils literal notranslate"><span class="pre">allowlist</span></code> file.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">cpuid()</span></code></dt><dd><p>Get the <code class="docutils literal notranslate"><span class="pre">cpuid</span></code> of the current platform.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code></dt><dd><p>Returns the name of the plugin to use when this plugin is
registered with the <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> 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>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code></dt><dd><p>Returns a pointer to a new <code class="docutils literal notranslate"><span class="pre">MSRIOGroup</span></code> 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>
</dd>
</dl>
</section>
<section id="enum-type">
<h2>Enum Type<a class="headerlink" href="#enum-type" title="Permalink to this heading"></a></h2>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">enum</span><span class="w"> </span><span class="nc">m_cpuid_e</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">M_CPUID_SNB</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x62D</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_IVT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x63E</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_HSX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x63F</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_BDX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x64F</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_KNL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x657</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_SKX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x655</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_CPUID_ICX</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x66A</span><span class="p">,</span>
<span class="p">};</span>
</pre></div>
</div>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">enum</span> <span class="pre">m_cpuid_e</span></code></dt><dd><p>Contains the list of currently-supported <code class="docutils literal notranslate"><span class="pre">cpuid</span></code> values. The <code class="docutils literal notranslate"><span class="pre">cpuid</span></code>
can be determined by running <code class="docutils literal notranslate"><span class="pre">lscpu</span></code> and appending the CPU family
in hex to the Model in hex.</p>
</dd>
</dl>
</section>
<section id="environment">
<h2>Environment<a class="headerlink" href="#environment" title="Permalink to this heading"></a></h2>
<p>If the <code class="docutils literal notranslate"><span class="pre">GEOPM_MSR_CONFIG_PATH</span></code> environment variable is set to a
colon-separated list of paths, the paths will be checked for files
starting with <code class="docutils literal notranslate"><span class="pre">msr_</span></code> and ending in <code class="docutils literal notranslate"><span class="pre">.json</span></code>. The <code class="docutils literal notranslate"><span class="pre">/etc/geopm</span></code> directory
will also be searched. The <code class="docutils literal notranslate"><span class="pre">MSRIOGroup</span></code> will attempt to load additional
MSR definitions from any JSON file it finds. The files must follow this
schema:</p>
<div class="highlight-json notranslate"><div class="highlight"><pre><span></span><span class="p">{</span>
<span class="w"> </span><span class="nt">"$schema"</span><span class="p">:</span><span class="w"> </span><span class="s2">"http://json-schema.org/draft-04/schema#"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"https://geopm.github.io/msrs.schema.json"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"title"</span><span class="p">:</span><span class="w"> </span><span class="s2">"MSR specification"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"definitions"</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"msrFields"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"begin_bit"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"integer"</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"end_bit"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"integer"</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"function"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"enum"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"scale"</span><span class="p">,</span><span class="w"> </span><span class="s2">"log_half"</span><span class="p">,</span><span class="w"> </span><span class="s2">"7_bit_float"</span><span class="p">,</span><span class="w"> </span><span class="s2">"overflow"</span><span class="p">,</span><span class="w"> </span><span class="s2">"logic"</span><span class="p">]</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"units"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"enum"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"none"</span><span class="p">,</span><span class="w"> </span><span class="s2">"seconds"</span><span class="p">,</span><span class="w"> </span><span class="s2">"hertz"</span><span class="p">,</span><span class="w"> </span><span class="s2">"watts"</span><span class="p">,</span><span class="w"> </span><span class="s2">"joules"</span><span class="p">,</span><span class="w"> </span><span class="s2">"celsius"</span><span class="p">]</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"scalar"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"number"</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"behavior"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"enum"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"constant"</span><span class="p">,</span><span class="w"> </span><span class="s2">"monotone"</span><span class="p">,</span><span class="w"> </span><span class="s2">"variable"</span><span class="p">,</span><span class="w"> </span><span class="s2">"label"</span><span class="p">]</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"writeable"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"boolean"</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"aggregation"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"enum"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"sum"</span><span class="p">,</span><span class="w"> </span><span class="s2">"average"</span><span class="p">,</span><span class="w"> </span><span class="s2">"median"</span><span class="p">,</span><span class="w"> </span><span class="s2">"logical_and"</span><span class="p">,</span><span class="w"> </span><span class="s2">"logical_or"</span><span class="p">,</span><span class="w"> </span><span class="s2">"region_hash"</span><span class="p">,</span><span class="w"> </span><span class="s2">"region_hint"</span><span class="p">,</span><span class="w"> </span><span class="s2">"min"</span><span class="p">,</span><span class="w"> </span><span class="s2">"max"</span><span class="p">,</span><span class="w"> </span><span class="s2">"stddev"</span><span class="p">,</span><span class="w"> </span><span class="s2">"select_first"</span><span class="p">,</span><span class="w"> </span><span class="s2">"expect_same"</span><span class="p">]</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"description"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"required"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"begin_bit"</span><span class="p">,</span><span class="w"> </span><span class="s2">"end_bit"</span><span class="p">,</span><span class="w"> </span><span class="s2">"function"</span><span class="p">,</span><span class="w"> </span><span class="s2">"scalar"</span><span class="p">,</span><span class="w"> </span><span class="s2">"units"</span><span class="p">,</span><span class="w"> </span><span class="s2">"writeable"</span><span class="p">,</span><span class="w"> </span><span class="s2">"behavior"</span><span class="p">,</span><span class="w"> </span><span class="s2">"aggregation"</span><span class="p">],</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"msrObject"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"offset"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"string"</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"domain"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"enum"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"board"</span><span class="p">,</span><span class="w"> </span><span class="s2">"package"</span><span class="p">,</span><span class="w"> </span><span class="s2">"core"</span><span class="p">,</span><span class="w"> </span><span class="s2">"cpu"</span><span class="p">,</span><span class="w"> </span><span class="s2">"memory"</span><span class="p">,</span><span class="w"> </span><span class="s2">"package_integrated_memory"</span><span class="p">,</span><span class="w"> </span><span class="s2">"nic"</span><span class="p">,</span><span class="w"> </span><span class="s2">"package_integrated_nic"</span><span class="p">,</span><span class="w"> </span><span class="s2">"gpu"</span><span class="p">,</span><span class="w"> </span><span class="s2">"package_integrated_gpu"</span><span class="p">,</span><span class="w"> </span><span class="s2">"gpu_chip"</span><span class="p">]</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"fields"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"$ref"</span><span class="p">:</span><span class="w"> </span><span class="s2">"#/definitions/msrFields"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"required"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"offset"</span><span class="p">,</span><span class="w"> </span><span class="s2">"domain"</span><span class="p">,</span><span class="w"> </span><span class="s2">"fields"</span><span class="p">],</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"msrs"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"type"</span><span class="p">:</span><span class="w"> </span><span class="s2">"object"</span><span class="p">,</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="nt">"$ref"</span><span class="p">:</span><span class="w"> </span><span class="s2">"#/definitions/msrObject"</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">},</span>
<span class="w"> </span><span class="nt">"additionalProperties"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span>
<span class="p">}</span>
</pre></div>
</div>
</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 internal" href="GEOPM_CXX_MAN_IOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a>,
<a class="reference internal" href="geopm_pio_msr.7.html"><span class="doc">geopm_pio_msr(7)</span></a>,
<a class="reference internal" href="GEOPM_CXX_MAN_MSRIO.3.html"><span class="doc">geopm::MSRIO(3)</span></a>,
<a class="reference internal" href="geopmlaunch.1.html"><span class="doc">geopmlaunch(1)</span></a></p>
</section>
</section>
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