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.
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NEWS
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NEWS
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@ -19,6 +19,11 @@ CHANGES WITH 243 in spe:
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are harder to type, but we believe the change from 5 digit PIDs to 7
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are harder to type, but we believe the change from 5 digit PIDs to 7
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digit PIDs is not too hampering for usability.
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digit PIDs is not too hampering for usability.
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* MemoryLow and MemoryMin gained hierarchy-aware counterparts,
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DefaultMemoryLow and DefaultMemoryMin, which can be used to
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hierarchically set default memory protection values for a particular
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subtree of the unit hierarchy.
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…
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…
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CHANGES WITH 242:
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CHANGES WITH 242:
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@ -227,6 +227,7 @@ All cgroup/resource control settings are available for transient units
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✓ CPUQuota=
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✓ CPUQuota=
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✓ CPUQuotaPeriodSec=
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✓ CPUQuotaPeriodSec=
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✓ MemoryAccounting=
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✓ MemoryAccounting=
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✓ DefaultMemoryMin=
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✓ MemoryMin=
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✓ MemoryMin=
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✓ DefaultMemoryLow=
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✓ DefaultMemoryLow=
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✓ MemoryLow=
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✓ MemoryLow=
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@ -245,6 +245,10 @@
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<para>This setting is supported only if the unified control group hierarchy is used and disables
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<para>This setting is supported only if the unified control group hierarchy is used and disables
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<varname>MemoryLimit=</varname>.</para>
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<varname>MemoryLimit=</varname>.</para>
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<para>Units may have their children use a default <literal>memory.min</literal> value by specifying
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<varname>DefaultMemoryMin=</varname>, which has the same semantics as <varname>MemoryMin=</varname>. This setting
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does not affect <literal>memory.min</literal> in the unit itself.</para>
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</listitem>
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</listitem>
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</varlistentry>
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</varlistentry>
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@ -266,8 +270,8 @@
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<para>This setting is supported only if the unified control group hierarchy is used and disables
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<para>This setting is supported only if the unified control group hierarchy is used and disables
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<varname>MemoryLimit=</varname>.</para>
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<varname>MemoryLimit=</varname>.</para>
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<para>Units may can have their children use a default <literal>memory.low</literal> value by specifying
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<para>Units may have their children use a default <literal>memory.low</literal> value by specifying
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<varname>DefaultMemoryLow=</varname>, which has the same usage as <varname>MemoryLow=</varname>. This setting
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<varname>DefaultMemoryLow=</varname>, which has the same semantics as <varname>MemoryLow=</varname>. This setting
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does not affect <literal>memory.low</literal> in the unit itself.</para>
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does not affect <literal>memory.low</literal> in the unit itself.</para>
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</listitem>
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</listitem>
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</varlistentry>
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</varlistentry>
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