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wegen/FrOSCon26/FrOSCon.26.mm
Ichthyostega df04350e33 Textentwurf für den Call-of-Papers 
Mit dem etablierten Schema war das nicht schwer...
Fehlen nur noch ein paar technische Details
2026-05-23 04:57:54 +02:00

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ich hatte mir ja im Vorfeld &#252;berlegt, was f&#252;r ein Publikum vermutlich auf der FrOSCon heruml&#228;uft; dem entsprechend war der Vortrag auf &#187;Allgemeinbildungs-Niveau&#171; angelegt.... (was allerdings auch bereits f&#252;r Benny eine erhebliche Herausforderung war, also vermutlich auch f&#252;r andere Leute)
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in die Sektion: <b>Research</b>
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...mein langfristiger Plan: ich will eine <b>Knowledge-Base</b>&#160;schaffen
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neues <b>Git-Repo</b>&#160;nur f&#252;r den Demo-Code anlegen
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verwende <font face="Monospaced" color="#1820af">qrencode</font>
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Es war von Anfang an klar, da&#223; wir <i>speziell dieses Thema selber unter Kontrolle bringen </i>m&#252;ssen.
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<p>
Christian hatte seinerzeit ein MMAP-Backend implementiert. Ich folge dem gleichen Ansatz, gehe aber mit der Linux-Kernelentwicklung mit...
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was wir zeigen <i>k&#246;nnen</i>
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<node CREATED="1779397215245" ID="ID_533486044" LINK="https://lwn.net/Articles/810414/" MODIFIED="1779397234502" TEXT="LWN: rapid growth of io_uring (2020)"/>
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<node CREATED="1779399048372" ID="ID_1376049416" LINK="https://unixism.net/loti/" MODIFIED="1779399068596" TEXT="&#xbb;Lord of the uring&#xab;"/>
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<node CREATED="1779396332330" ID="ID_1277198826" MODIFIED="1779396361916" TEXT="zwei Ringbuffer (&quot;queue rings&quot; &#x27f6; daher der Name)"/>
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<p>
man setzt einen Socket auf &quot;asynchron&quot;. Durch cleveres Polling bekommt man mit, wann die IO-Operation &#187;ready&#171; wird. <b>Aber</b>&#160;das ist readyness-semantics, not completion-semantics. Und es ist sehr limitiert, und setzt eine komplexe State-Machine im Userland vorraus
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<head>
</head>
<body>
<p>
Arbeitet in einem speziellen Modus, IO_DIRECT
</p>
<p>
Kann nur bereits allozierte/ ge&#246;ffnete Files bearbeiten
</p>
<p>
kann nicht mit generischen Sockets arbeiten &#10230; auch kein Networking
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<p>
geht am Page Cache vorbei
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</head>
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<p>
Aus einem Kommentar auf LWN
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<p>
https://lwn.net/Articles/810898/
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<p http-equiv="content-type" content="text/html; charset=utf-8">
What it says about the state of hardware is easy.<br />
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<p>
Meltdown mitigations made context switching more expensive, and SSDs made the actual I/O cheaper. At some point, you're spending almost as much time context switching as you are doing actual work, and there's nothing Linux can do about it because it's all tied up in the architecture of the MMU and the processor's cache. Thus, it now makes sense to design the interface around reducing the number of context switches at all cost, instead of just assuming that the cost of doing the actual I/O will dominate.
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<head>
</head>
<body>
<p>
extended Berkeley Package Filter: ein Framework, das Code als Reaktion auf Events direkt im Kernel-Kontext ausf&#252;hrt
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</head>
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<p>
Es wurde alsbald erheblich als Einfallstor f&#252;r Exploits genutzt, da das bestehende Security-Tooling diese neuen Mechanismen &#252;berhaupt nicht &#187;auf dem Schirm&#171; hat. Im Jahr 2023 hat das Google-Security-Team 60% aller Linux-Exploits dem IO_URING subsystem zugeordnet. Daher ist es auf Android und ChromeOS und unter Docker in der Standard-Konfiguration deaktiviert (und hat einen schlechten Ruf unter den &#187;Oldtimern&#171;)
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<node CREATED="1779397402228" ID="ID_1111670287" LINK="https://github.com/axboe/liburing" MODIFIED="1779397445634" TEXT="die liburing erleichtert den Umgang mit dem anspruchsvollen API">
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</head>
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<li>
adoption is rising
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<li>
io_uring is not going away anywhere soon
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</head>
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<p>
...denn das bedeutet, da ist nichts &#187;mainstreamiges&#171; unterwegs, von dem ich noch nichts w&#252;&#223;te.
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org<font size="3">a</font><font size="1">nisatorisch</font>
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