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-rw-r--r--man/systemd.resource-control.xml25
1 files changed, 25 insertions, 0 deletions
diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index 8a95e1196b..066f2cc19b 100644
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -99,6 +99,31 @@
</refsect1>
<refsect1>
+ <title>Unified and Legacy Control Group Hierarchies</title>
+
+ <para>Unified control group hierarchy is the new version of kernel control group interface. Depending on the
+ resource type, there are differences in resource control capabilities. Also, because of interface changes, some
+ resource types have a separate set of options on the unified hierarchy.</para>
+
+ <para>
+ <variablelist>
+ <varlistentry>
+ <term><option>IO</option></term>
+ <listitem>
+ <para><varname>IO</varname> prefixed settings are superset of and replace <varname>BlockIO</varname>
+ prefixed ones. On unified hierarchy, IO resource control also applies to buffered writes.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+
+ <para>To ease the transition, there is best-effort translation between the two versions of settings. If all
+ settings of a unit for a given resource type are for the other hierarchy type, the settings are translated and
+ applied. If there are any valid settings for the hierarchy in use, all translations are disabled for the resource
+ type. Mixing the two types of settings on a unit can lead to confusing results.</para>
+ </refsect1>
+
+ <refsect1>
<title>Options</title>
<para>Units of the types listed above can have settings