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Diffstat (limited to 'man/systemd.resource-control.xml')
| -rw-r--r-- | man/systemd.resource-control.xml | 25 |
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 |