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<section id="damon-data-access-monitoring-and-access-aware-system-operations">
<h1>DAMON: Data Access MONitoring and Access-aware System Operations<a class="headerlink" href="#damon-data-access-monitoring-and-access-aware-system-operations" title="Link to this heading">¶</a></h1>
<p>DAMON is a Linux kernel subsystem that provides a framework for data access
monitoring and the monitoring results based system operations. The core
monitoring <a class="reference internal" href="design.html#damon-design-monitoring"><span class="std std-ref">mechanisms</span></a> of DAMON make it</p>
<blockquote>
<div><ul class="simple">
<li><p><em>accurate</em> (the monitoring output is useful enough for DRAM level memory
management; It might not appropriate for CPU Cache levels, though),</p></li>
<li><p><em>light-weight</em> (the monitoring overhead is low enough to be applied online),
and</p></li>
<li><p><em>scalable</em> (the upper-bound of the overhead is in constant range regardless
of the size of target workloads).</p></li>
</ul>
</div></blockquote>
<p>Using this framework, therefore, the kernel can operate system in an
access-aware fashion. Because the features are also exposed to the <a class="reference internal" href="../../admin-guide/mm/damon/index.html"><span class="doc">user
space</span></a>, users who have special information about
their workloads can write personalized applications for better understanding
and optimizations of their workloads and systems.</p>
<p>For easier development of such systems, DAMON provides a feature called
<a class="reference internal" href="design.html#damon-design-damos"><span class="std std-ref">DAMOS</span></a> (DAMon-based Operation Schemes) in addition
to the monitoring. Using the feature, DAMON users in both kernel and <a class="reference internal" href="../../admin-guide/mm/damon/index.html"><span class="doc">user
spaces</span></a> can do access-aware system operations
with no code but simple configurations.</p>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="faq.html">Frequently Asked Questions</a><ul>
<li class="toctree-l2"><a class="reference internal" href="faq.html#does-damon-support-virtual-memory-only">Does DAMON support virtual memory only?</a></li>
<li class="toctree-l2"><a class="reference internal" href="faq.html#can-i-simply-monitor-page-granularity">Can I simply monitor page granularity?</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="design.html">Design</a><ul>
<li class="toctree-l2"><a class="reference internal" href="design.html#execution-model-and-data-structures">Execution Model and Data Structures</a></li>
<li class="toctree-l2"><a class="reference internal" href="design.html#overall-architecture">Overall Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="design.html#operations-set-layer">Operations Set Layer</a></li>
<li class="toctree-l2"><a class="reference internal" href="design.html#core-logics">Core Logics</a></li>
<li class="toctree-l2"><a class="reference internal" href="design.html#modules">Modules</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="api.html">API Reference</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api.html#structures">Structures</a></li>
<li class="toctree-l2"><a class="reference internal" href="api.html#functions">Functions</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="maintainer-profile.html">DAMON Maintainer Entry Profile</a><ul>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#scm-trees">SCM Trees</a></li>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#submit-checklist-addendum">Submit checklist addendum</a></li>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#key-cycle-dates">Key cycle dates</a></li>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#review-cadence">Review cadence</a></li>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#mailing-tool">Mailing tool</a></li>
<li class="toctree-l2"><a class="reference internal" href="maintainer-profile.html#community-meetup">Community meetup</a></li>
</ul>
</li>
</ul>
</div>
<p>To utilize and control DAMON from the user-space, please refer to the
administration <a class="reference internal" href="../../admin-guide/mm/damon/index.html"><span class="doc">guide</span></a>.</p>
<p>If you prefer academic papers for reading and citations, please use the papers
from <a class="reference external" href="https://dl.acm.org/doi/abs/10.1145/3502181.3531466">HPDC’22</a> and
<a class="reference external" href="https://dl.acm.org/doi/abs/10.1145/3366626.3368125">Middleware19 Industry</a> .
Note that those cover DAMON implementations in Linux v5.16 and v5.15,
respectively.</p>
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