timesyncd: properly handle multiple configured NTP servers and multiplei IP addresses...

[elogind.git] / man / systemd.resource-control.xml

diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index c3fd5fcee4151d95e618a78c06a8e508636b9a3c..5a996fd6df1a7e75b58f7cd8de1c276049d772fe 100644 (file)
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -117,11 +117,53 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
         <term><varname>CPUShares=<replaceable>weight</replaceable></varname></term>
 
         <listitem>
-          <para>Assign the specified overall CPU time share weight to
-          the processes executed. Takes an integer value. This
-          controls the <literal>cpu.shares</literal> control group
-          attribute, which defaults to 1024. For details about this
-          control group attribute, see <ulink
+          <para>Assign the specified CPU time share weight to the
+          processes executed. Takes an integer value. This controls
+          the <literal>cpu.shares</literal> control group attribute,
+          which defaults to 1024. For details about this control group
+          attribute, see <ulink
+          url="https://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt">sched-design-CFS.txt</ulink>
+          The available CPU time is split up among all units within a
+          slice relative to their CPU time share weight.</para>
+
+          <para>Implies <literal>CPUAccounting=true</literal>.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>CPUQuota=</varname></term>
+
+        <listitem>
+          <para>Assign the specified CPU time quota to the processes
+          executed. Takes a percentage value (suffixed with "%") or an
+          absolute time (suffixed by one of the common time units, us,
+          ms, s, ...). The percentage specifies how much CPU time the
+          unit shall get at maximum, relative to the total CPU time
+          available on one CPU. Use values > 100% for alloting CPU
+          time on more than one CPU. If an absolute time is specified
+          the processes of this unit will get this much absolute time
+          within each quota period, at maximum. This controls the
+          <literal>cpu.cfs_quota_us</literal> control group
+          attribute. For details about this control group attribute,
+          see <ulink
+          url="https://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt">sched-design-CFS.txt</ulink>.</para>
+
+          <para>Example: <varname>CPUShares=20%</varname> ensures that
+          the executed processes will never get more than 20% CPU time
+          on one CPU.</para>
+
+          <para>Implies <literal>CPUAccounting=true</literal>.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>CPUQuotaPeriodSec=</varname></term>
+
+        <listitem>
+          <para>Specify the CPU quota period to use. Defaults to
+          100ms. This controls the <literal>cpu.cfs_period_us</literal>
+          control group attribute. For details about this control
+          group attribute, see <ulink
           url="https://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt">sched-design-CFS.txt</ulink>.</para>
 
           <para>Implies <literal>CPUAccounting=true</literal>.</para>
@@ -275,12 +317,16 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
           followed by a device group name, as listed in
           <filename>/proc/devices</filename>. The latter is useful to
           whitelist all current and future devices belonging to a
-          specific device group at once. Examples:
-          <filename>/dev/sda5</filename> is a path to a device node,
-          referring to an ATA or SCSI block
+          specific device group at once. The device group is matched
+          according to file name globbing rules, you may hence use the
+          <literal>*</literal> and <literal>?</literal>
+          wildcards. Examples: <filename>/dev/sda5</filename> is a
+          path to a device node, referring to an ATA or SCSI block
           device. <literal>char-pts</literal> and
           <literal>char-alsa</literal> are specifiers for all pseudo
-          TTYs and all ALSA sound devices, respectively.</para>
+          TTYs and all ALSA sound devices,
+          respectively. <literal>char-cpu/*</literal> is a specifier
+          matching all CPU related device groups.</para>
         </listitem>
       </varlistentry>