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readahead: document options and commands.
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<para><filename>systemd-readahead-collect.service</filename></para>
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<para><filename>systemd-readahead-done.service</filename></para>
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<para><filename>systemd-readahead-done.timer</filename></para>
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<para><filename>/usr/lib/systemd/systemd-readahead</filename></para>
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<cmdsynopsis>
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<command>/usr/lib/systemd/systemd-readahead/systemd-readahead</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">COMMAND</arg>
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<arg choice="opt">DIRECTORY | FILE</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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@ -103,6 +108,95 @@
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optimize subsequent boot times.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para><filename>systemd-readahead</filename> understands
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the following options:</para>
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<variablelist>
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<varlistentry>
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<term><option>-h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help text
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and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--max-files=</option></term>
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<listitem><para>Maximum number of
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files to read ahead. Only valid
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for thes <command>collect</command>
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command.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--file-size-max=</option></term>
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<listitem><para>Maximum size of files
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(in bytes) to read ahead. Only valid
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for the <command>collect</command>
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and <command>replay</command>
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commands.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--timeout=</option></term>
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<listitem><para>Maximum time (in usec)
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to to spend collecting data. Only valid
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for the <command>collect</command>
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command.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood by
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<filename>systemd-readahead</filename>:</para> <variablelist>
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<varlistentry>
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<term><command>collect
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[<replaceable>DIRECTORY</replaceable>]</command></term>
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<listitem>
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<para>Collect read-ahead data on
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early boot. When terminating it will
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write out a pack file to the indicated
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directory containing the read-ahead
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data. </para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>replay
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[<replaceable>DIRECTORY</replaceable>]</command></term>
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<listitem>
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<para>Perform read-ahead on the
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specified directory tree.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>analyze
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[<replaceable>FILE</replaceable>]</command></term>
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<listitem>
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<para>Dumps the content of the
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read-ahead pack file to the
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terminal. The output lists
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approximately for each file
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how much will be read-ahead by
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the <command>replay</command>
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command.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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