cgroup: Polish hierarchically aware protection docs a bit

I missed adding a section in `systemd.resource-control` about
DefaultMemoryMin in #12332.

Also, add a NEWS entry going over the general concept.

diff --git a/NEWS b/NEWS
index 057484c..57ed27a 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -19,6 +19,11 @@ CHANGES WITH 243 in spe:
           are harder to type, but we believe the change from 5 digit PIDs to 7
           digit PIDs is not too hampering for usability.
 
+        * MemoryLow and MemoryMin gained hierarchy-aware counterparts,
+          DefaultMemoryLow and DefaultMemoryMin, which can be used to
+          hierarchically set default memory protection values for a particular
+          subtree of the unit hierarchy.
+
           …
 
 CHANGES WITH 242:

diff --git a/docs/TRANSIENT-SETTINGS.md b/docs/TRANSIENT-SETTINGS.md
index 3aa68c0..469ef7c 100644 (file)
--- a/docs/TRANSIENT-SETTINGS.md
+++ b/docs/TRANSIENT-SETTINGS.md
@@ -227,6 +227,7 @@ All cgroup/resource control settings are available for transient units
 ✓ CPUQuota=
 ✓ CPUQuotaPeriodSec=
 ✓ MemoryAccounting=
+✓ DefaultMemoryMin=
 ✓ MemoryMin=
 ✓ DefaultMemoryLow=
 ✓ MemoryLow=

diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index e7fb468..95209a8 100644 (file)
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -245,6 +245,10 @@
 
           <para>This setting is supported only if the unified control group hierarchy is used and disables
           <varname>MemoryLimit=</varname>.</para>
+
+          <para>Units may have their children use a default <literal>memory.min</literal> value by specifying
+          <varname>DefaultMemoryMin=</varname>, which has the same semantics as <varname>MemoryMin=</varname>. This setting
+          does not affect <literal>memory.min</literal> in the unit itself.</para>
         </listitem>
       </varlistentry>
 
@@ -266,8 +270,8 @@
           <para>This setting is supported only if the unified control group hierarchy is used and disables
           <varname>MemoryLimit=</varname>.</para>
 
-          <para>Units may can have their children use a default <literal>memory.low</literal> value by specifying
-          <varname>DefaultMemoryLow=</varname>, which has the same usage as <varname>MemoryLow=</varname>. This setting
+          <para>Units may have their children use a default <literal>memory.low</literal> value by specifying
+          <varname>DefaultMemoryLow=</varname>, which has the same semantics as <varname>MemoryLow=</varname>. This setting
           does not affect <literal>memory.low</literal> in the unit itself.</para>
         </listitem>
       </varlistentry>