116 lines
5.2 KiB
XML
116 lines
5.2 KiB
XML
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 960 252" width="960" height="252"
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role="img" aria-labelledby="title desc">
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<title id="title">An arena after some allocations</title>
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<desc id="desc">A reserved address range from lo_ to hi_. Allocated memory (used plus
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per-allocation overhead) runs from lo_ to free_; available memory runs from free_ to
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limit_; together they are the committed memory. From limit_ to hi_ is uncommitted:
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address space with no physical memory behind it. Committed plus uncommitted is the
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reserved range.</desc>
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<!-- Palette matches the animated version in _static/arena-lifecycle.html -->
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<defs>
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<pattern id="hatch" width="8" height="8" patternTransform="rotate(45)"
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patternUnits="userSpaceOnUse">
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<rect width="8" height="8" fill="#D6DCE4"/>
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<line x1="0" y1="0" x2="0" y2="8" stroke="#C2CAD4" stroke-width="1.4"/>
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</pattern>
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</defs>
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<rect width="960" height="252" fill="#FFFFFF"/>
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<g font-family="ui-monospace, SFMono-Regular, Menlo, Consolas, monospace" font-size="13">
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<!-- span brackets -->
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<g stroke="#7E8998" stroke-width="1" fill="none">
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<path d="M60 24 v8 M60 28 H900 M900 24 v8"/>
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<path d="M60 52 v8 M60 56 H540 M540 52 v8"/>
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<path d="M540 52 v8 M540 56 H900 M900 52 v8"/>
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</g>
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<g fill="#55626F" text-anchor="middle">
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<rect x="440" y="18" width="80" height="20" fill="#FFFFFF"/>
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<text x="480" y="32">reserved</text>
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<rect x="255" y="46" width="90" height="20" fill="#FFFFFF"/>
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<text x="300" y="60">committed</text>
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<rect x="672" y="46" width="96" height="20" fill="#FFFFFF"/>
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<text x="720" y="60">uncommitted</text>
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<rect x="128" y="74" width="84" height="20" fill="#FFFFFF"/>
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<text x="165" y="88">allocated</text>
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<rect x="366" y="74" width="78" height="20" fill="#FFFFFF"/>
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<text x="405" y="88">available</text>
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</g>
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<!-- superpage ticks -->
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<g stroke="#C7D0DB" stroke-width="1">
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<path d="M60 96 v8 M120 96 v8 M180 96 v8 M240 96 v8 M300 96 v8 M360 96 v8
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M780 96 v8 M840 96 v8 M900 96 v8"/>
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</g>
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<!-- the range -->
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<rect x="540" y="104" width="360" height="56" fill="url(#hatch)"/>
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<rect x="270" y="104" width="270" height="56" fill="#E7DCCE"/>
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<!-- allocations: an 8-byte header (lighter) then payload, one block each -->
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<g>
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<rect x="60" y="104" width="26" height="56" fill="#6FAAB0"/>
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<rect x="62" y="104" width="24" height="56" fill="#0F6E77"/>
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<rect x="86" y="104" width="18" height="56" fill="#6FAAB0"/>
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<rect x="88" y="104" width="16" height="56" fill="#0F6E77"/>
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<rect x="104" y="104" width="34" height="56" fill="#6FAAB0"/>
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<rect x="106" y="104" width="32" height="56" fill="#0F6E77"/>
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<rect x="138" y="104" width="22" height="56" fill="#6FAAB0"/>
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<rect x="140" y="104" width="20" height="56" fill="#0F6E77"/>
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<rect x="160" y="104" width="14" height="56" fill="#6FAAB0"/>
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<rect x="162" y="104" width="12" height="56" fill="#0F6E77"/>
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<rect x="204" y="104" width="20" height="56" fill="#6FAAB0"/>
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<rect x="206" y="104" width="18" height="56" fill="#0F6E77"/>
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<rect x="224" y="104" width="24" height="56" fill="#6FAAB0"/>
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<rect x="226" y="104" width="22" height="56" fill="#0F6E77"/>
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<rect x="248" y="104" width="22" height="56" fill="#6FAAB0"/>
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<rect x="250" y="104" width="20" height="56" fill="#0F6E77"/>
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</g>
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<rect x="60" y="104" width="840" height="56" fill="none" stroke="#C7D0DB"/>
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<!-- limit_: the commit frontier, always on a superpage boundary -->
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<rect x="539" y="98" width="2" height="68" fill="#B25A0F"/>
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<!-- free_: the bump pointer -->
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<rect x="269.5" y="104" width="1" height="56" fill="#101720"/>
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<!-- pointer labels -->
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<g stroke="#7E8998" stroke-width="1">
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<path d="M60 166 v10 M270 166 v10 M540 166 v10 M900 166 v10"/>
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</g>
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<g fill="#101720" font-size="13">
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<text x="60" y="192" text-anchor="start">lo_</text>
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<text x="270" y="192" text-anchor="middle">free_</text>
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<text x="540" y="192" text-anchor="middle">limit_</text>
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<text x="900" y="192" text-anchor="end">hi_</text>
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</g>
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<!-- legend -->
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<g font-family="system-ui, -apple-system, Segoe UI, Roboto, sans-serif" font-size="12.5"
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fill="#55626F">
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<rect x="60" y="216" width="13" height="13" fill="#0F6E77" stroke="#C7D0DB"/>
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<text x="80" y="227">used — payload bytes</text>
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<rect x="222" y="216" width="13" height="13" fill="#6FAAB0" stroke="#C7D0DB"/>
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<text x="242" y="227">overhead — header + padding</text>
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<rect x="450" y="216" width="13" height="13" fill="#E7DCCE" stroke="#C7D0DB"/>
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<text x="470" y="227">available — committed, not handed out</text>
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<rect x="756" y="216" width="13" height="13" fill="url(#hatch)" stroke="#C7D0DB"/>
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<text x="776" y="227">uncommitted — addresses only</text>
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</g>
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</g>
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</svg>
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