__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<section id="slab-allocation">
<h1>Slab Allocation<a class="headerlink" href="#slab-allocation" title="Link to this heading">¶</a></h1>
<section id="functions-and-structures">
<h2>Functions and structures<a class="headerlink" href="#functions-and-structures" title="Link to this heading">¶</a></h2>
<dl class="c macro">
<dt class="sig sig-object c" id="c.folio_slab">
<span class="sig-name descname"><span class="n"><span class="pre">folio_slab</span></span></span><a class="headerlink" href="#c.folio_slab" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p><code class="docutils literal notranslate"><span class="pre">folio_slab</span> <span class="pre">(folio)</span></code></p>
<blockquote>
<div><p>Converts from folio to slab.</p>
</div></blockquote>
<div class="kernelindent docutils container">
<p><strong>Parameters</strong></p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">folio</span></code></dt><dd><p>The folio.</p>
</dd>
</dl>
<p><strong>Description</strong></p>
<p>Currently <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code> is a different representation of a folio where
<code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">folio_test_slab()</span></code> is true.</p>
<p><strong>Return</strong></p>
<p>The slab which contains this folio.</p>
</div>
<dl class="c macro">
<dt class="sig sig-object c" id="c.slab_folio">
<span class="sig-name descname"><span class="n"><span class="pre">slab_folio</span></span></span><a class="headerlink" href="#c.slab_folio" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p><code class="docutils literal notranslate"><span class="pre">slab_folio</span> <span class="pre">(s)</span></code></p>
<blockquote>
<div><p>The folio allocated for a slab</p>
</div></blockquote>
<div class="kernelindent docutils container">
<p><strong>Parameters</strong></p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">s</span></code></dt><dd><p>The slab.</p>
</dd>
</dl>
<p><strong>Description</strong></p>
<p>Slabs are allocated as folios that contain the individual objects and are
using some fields in the first <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">page</span></code> of the folio - those fields are
now accessed by <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code>. It is occasionally necessary to convert back to
a folio in order to communicate with the rest of the mm.  Please use this
helper function instead of casting yourself, as the implementation may change
in the future.</p>
</div>
<dl class="c macro">
<dt class="sig sig-object c" id="c.page_slab">
<span class="sig-name descname"><span class="n"><span class="pre">page_slab</span></span></span><a class="headerlink" href="#c.page_slab" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p><code class="docutils literal notranslate"><span class="pre">page_slab</span> <span class="pre">(p)</span></code></p>
<blockquote>
<div><p>Converts from first <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">page</span></code> to slab.</p>
</div></blockquote>
<div class="kernelindent docutils container">
<p><strong>Parameters</strong></p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">p</span></code></dt><dd><p>The first (either head of compound or single) page of slab.</p>
</dd>
</dl>
<p><strong>Description</strong></p>
<p>A temporary wrapper to convert <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">page</span></code> to <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code> in situations where
we know the page is the compound head, or single order-0 page.</p>
<p>Long-term ideally everything would work with <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code> directly or go
through folio to <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code>.</p>
<p><strong>Return</strong></p>
<p>The slab which contains this page</p>
</div>
<dl class="c macro">
<dt class="sig sig-object c" id="c.slab_page">
<span class="sig-name descname"><span class="n"><span class="pre">slab_page</span></span></span><a class="headerlink" href="#c.slab_page" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>

<p><code class="docutils literal notranslate"><span class="pre">slab_page</span> <span class="pre">(s)</span></code></p>
<blockquote>
<div><p>The first <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">page</span></code> allocated for a slab</p>
</div></blockquote>
<div class="kernelindent docutils container">
<p><strong>Parameters</strong></p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">s</span></code></dt><dd><p>The slab.</p>
</dd>
</dl>
<p><strong>Description</strong></p>
<p>A convenience wrapper for converting slab to the first <code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">page</span></code> of the
underlying folio, to communicate with code not yet converted to folio or
<code class="xref c c-struct broken_xref docutils literal notranslate"><span class="pre">struct</span> <span class="pre">slab</span></code>.</p>
</div>
<dl class="c enum">
<dt class="sig sig-object c" id="c.slab_flags">
<span class="k"><span class="pre">enum</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">slab_flags</span></span></span><a class="headerlink" href="#c.slab_flags" title="Link to this definition">¶</a><br /></dt>
<dd><p>How the slab flags bits are used.</p>
</dd></dl>

<div class="kernelindent docutils container">
<p><strong>Constants</strong></p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">SL_locked</span></code></dt><dd><p>Is locked with <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">slab_lock()</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SL_partial</span></code></dt><dd><p>On the per-node partial list</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">SL_pfmemalloc</span></code></dt><dd><p>Was allocated from PF_MEMALLOC reserves</p>
</dd>
</dl>
</div>
<p><strong>Description</strong></p>
<p>The slab flags share space with the page flags but some bits have
different interpretations.  The high bits are used for information
like zone/node/section.</p>
</section>
</section>


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