chiark / gitweb /
build-sys: create Makefile-man.am automatically
[elogind.git] / man / systemd.conf.xml
index a6be932c73ad64137c61d54fbaee26800afdf634..8c8fb7d7c04041592d888458d9ff69442dac8a30 100644 (file)
                                 of controller names. Pass an empty
                                 string to ensure that systemd does not
                                 touch any hierarchies but its
-                                own.</para></listitem>
+                                own.</para>
+
+                                <para>Note that the default value of
+                                'cpu' will make realtime scheduling
+                                unavailable to system services. See
+                                <ulink
+                                url="http://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime">My
+                                Service Can't Get Realtime!</ulink>
+                                for more
+                                information.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
                                 'cpu,cpuacct'. Pass an empty string to
                                 ensure that systemd mounts all
                                 controllers in separate
-                                hierarchies.</para></listitem>
+                                hierarchies.</para>
+
+                                <para>Note that this option is only
+                                applied once, at very early boot. If
+                                you use an initial RAM disk (initrd)
+                                that uses systemd it might hence be
+                                necessary to rebuild the initrd if
+                                this option is changed, and make sure
+                                the new configuration file is included
+                                in it. Otherwise the initrd might
+                                mount the controller hierachies in a
+                                different configuration than intended,
+                                and the main system cannot remount
+                                them anymore.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
         <refsect1>
                   <title>See Also</title>
                   <para>
-                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                          <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                   </para>
         </refsect1>