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<?xml version="1.0" encoding="UTF-8"?>
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<?xml version="1.0" encoding="UTF-8"?>
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<chapter id="architecture">
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<chapter id="architecture">
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  <?dbhtml filename="arch.html"?>
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  <?dbhtml filename="arch.html"?>
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  <title>Architecture overview</title>
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  <title>Architecture Overview</title>
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  <para>The HelenOS operating system is designed as a relatively small
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  <para>The HelenOS operating system is designed as a relatively small
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  microkernel assisted with a set of userspace drivers and server tasks.
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  microkernel assisted with a set of userspace drivers and server tasks.
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  HelenOS is not very radical in what subsystems should or should not be
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  HelenOS is not very radical in what subsystems should or should not be
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  implemented in the kernel - in some cases, both kernel and userspace drivers
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  implemented in the kernel - in some cases, both kernel and userspace drivers
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    balanced by thread migration. Threads are scheduled by the round robing
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    balanced by thread migration. Threads are scheduled by the round robing
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    scheduling policy with respect to multiple priority run queues.</para>
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    scheduling policy with respect to multiple priority run queues.</para>
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  </section>
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  </section>
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  <section>
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  <section>
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    <title>Memory management</title>
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    <title>Memory Management</title>
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    <para>Memory management is another large subsystem in HelenOS. It serves
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    <para>Memory management is another large subsystem in HelenOS. It serves
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    the kernel to satisfy its own memory allocation requests, provides
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    the kernel to satisfy its own memory allocation requests, provides
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    translation between virtual and physical memory addresses and manages
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    translation between virtual and physical memory addresses and manages
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    virtual address spaces of userspace tasks.</para>
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    virtual address spaces of userspace tasks.</para>