oomd: notify via dbus what have been killed

man/org.freedesktop.oom1.xml

@@ -39,6 +39,9 @@ node /org/freedesktop/oom1 {
   interface org.freedesktop.oom1.Manager {
     methods:
       DumpByFileDescriptor(out h fd);
+    signals:
+      Killed(s cgroup,
+             s reason);
   };
   interface org.freedesktop.DBus.Peer { ... };
   interface org.freedesktop.DBus.Introspectable { ... };
@@ -56,12 +59,38 @@ node /org/freedesktop/oom1 {
 
     <variablelist class="dbus-method" generated="True" extra-ref="DumpByFileDescriptor()"/>
 
+    <variablelist class="dbus-signal" generated="True" extra-ref="Killed"/>
+
     <!--End of Autogenerated section-->
 
     <refsect2>
       <title>Methods</title>
 
-      <para>...</para>
+      <para><function>Killed</function> signal is sent when any cgroup is killed by oomd.</para>
+      <para>Note that more reasons will be added in the future, and the table below will be expanded accordingly.</para>
+      <table>
+        <title>Killing reasons</title>
+        <tgroup cols="2" align="left" colsep="1" rowsep="1">
+        <colspec colname="reason"/>
+        <colspec colname="description"/>
+        <thead>
+          <row>
+            <entry>Reason</entry>
+            <entry>Description</entry>
+          </row>
+        </thead>
+        <tbody>
+          <row>
+            <entry>memory-used</entry>
+            <entry>Application took too much memory and swap.</entry>
+          </row>
+          <row>
+            <entry>memory-pressure</entry>
+            <entry>Application took enough memory and swap to cause sufficient slowdown of other applications.</entry>
+          </row>
+        </tbody>
+        </tgroup>
+      </table>
     </refsect2>
   </refsect1>