<refnamediv>
<refname>systemd.cgroup</refname>
- <refpurpose>Cgroup configuration unit settings</refpurpose>
+ <refpurpose>Control Group configuration unit settings</refpurpose>
</refnamediv>
<refsynopsisdiv>
configuration options which configure the control group settings
for spawned processes.</para>
+ <para>Control Groups is a concept for organizing processes in a
+ hierarch tree of named groups for the purpose of resource
+ management.</para>
+
<para>This man page lists the configuration options shared by
those six unit types. See
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for cgroup configuration:</para>
<variablelist class='unit-directives'>
- <varlistentry>
- <term><varname>CPUAccounting=</varname></term>
-
- <listitem>
- <para>Turn on CPU usage accounting for this
- unit.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><varname>BlockIOAccounting=</varname></term>
-
- <listitem>
- <para>Turn on Block IO bandwidth accounting
- for this unit.</para>
- </listitem>
- </varlistentry>
<varlistentry>
- <term><varname>MemoryAccounting=</varname></term>
+ <term><varname>CPUAccounting=</varname></term>
<listitem>
- <para>Turn on process and kernel memory
- accounting for this unit.</para>
+ <para>Turn on CPU usage accounting for this unit. Takes a
+ boolean argument. Note that turning on CPU accounting for
+ one unit might also implicitly turn it on for all units
+ contained in the same slice and for all its parent slices and
+ the units contained therein.</para>
</listitem>
</varlistentry>
-
<varlistentry>
<term><varname>CPUShares=<replaceable>weight</replaceable></varname></term>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>MemoryAccounting=</varname></term>
+
+ <listitem>
+ <para>Turn on process and kernel memory accounting for this
+ unit. Takes a boolean argument. Note that turning on memory
+ accounting for one unit might also implicitly turn it on for
+ all units contained in the same slice and for all its parent
+ slices and the units contained therein.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>MemoryLimit=<replaceable>bytes</replaceable></varname></term>
- <term><varname>MemorySoftLimit=<replaceable>bytes</replaceable></varname></term>
<listitem>
- <para>Specify the hard and soft limits on maximum memory
- usage of the executed processes. The "hard" limit specifies
- how much process and kernel memory can be used by tasks in
- this unit, when there is no memory contention. If the kernel
- detects memory contention, memory reclaim will be performed
- until the memory usage is within the "soft" limit. Takes a
+ <para>Specify the limit on maximum memory usage of the
+ executed processes. The limit specifies how much process and
+ kernel memory can be used by tasks in this unit. Takes a
memory size in bytes. If the value is suffixed with K, M, G
or T, the specified memory size is parsed as Kilobytes,
Megabytes, Gigabytes, or Terabytes (with the base 1024),
respectively. This controls the
- <literal>memory.limit_in_bytes</literal> and
- <literal>memory.soft_limit_in_bytes</literal> control group
- attributes. For details about these control group attributes,
+ <literal>memory.limit_in_bytes</literal> control group
+ attribute. For details about this control group attribute,
see <ulink
url="https://www.kernel.org/doc/Documentation/cgroups/memory.txt">memory.txt</ulink>.</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>BlockIOAccounting=</varname></term>
+
+ <listitem>
+ <para>Turn on Block IO accounting for this unit. Takes a
+ boolean argument. Note that turning on block IO accounting
+ for one unit might also implicitly turn it on for all units
+ contained in the same slice and all for its parent slices and
+ the units contained therein.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>BlockIOWeight=<replaceable>weight</replaceable></varname></term>
defaults to 1000. For details about
this control group attribute, see
<ulink
- url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.</para></listitem>
+ url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.</para>
+
+ <para>Implies
+ <literal>BlockIOAccounting=true</literal>.</para>
+ </listitem>
</varlistentry>
<varlistentry>
times to set weights for multiple devices. For details about
this control group attribute, see <ulink
url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.</para>
+
+ <para>Implies
+ <literal>BlockIOAccounting=true</literal>.</para>
</listitem>
</varlistentry>
group attributes, see
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/blkio-controller.txt">blkio-controller.txt</ulink>.
</para>
+
+ <para>Implies
+ <literal>BlockIOAccounting=true</literal>.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><varname>Slice=</varname></term>
+
+ <listitem>
+ <para>The name of the slice unit to place the unit
+ in. Defaults to <filename>system.slice</filename> for all
+ non-instantiated units of all unit types (except for slice
+ units themselves see below). Instance units are by default
+ placed in a subslice of <filename>system.slice</filename>
+ that is named after the template name.</para>
+
+ <para>This option may be used to arrange systemd units in a
+ hierarchy of slices each of which might have resource
+ settings applied.</para>
+
+ <para>For units of type slice, the only accepted value for
+ this setting is the parent slice. Since the name of a slice
+ unit implies the parent slice, it is hence redundant to ever
+ set this parameter directly for slice units.</para>
+ </listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.swap</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
The documentation for control groups and specific controllers in the Linux kernel:
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>,
<ulink url="https://www.kernel.org/doc/Documentation/cgroups/cpuacct.txt">cpuacct.txt</ulink>,
~ianmdlvl / elogind.git / blobdiff