perf: add emulation_faults software perf event support

This patch adds support and documentation
for the emulation_faults perf event.

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>

docs/formatdomain.html.in

@@ -1955,6 +1955,7 @@
   <event name='page_faults_min' enabled='no'/>
   <event name='page_faults_maj' enabled='no'/>
   <event name='alignment_faults' enabled='no'/>
+  <event name='emulation_faults' enabled='no'/>
 </perf>
 ...
 </pre>
@@ -2090,6 +2091,14 @@
           applications running on the platform</td>
       <td><code>perf.alignment_faults</code></td>
     </tr>
+    <tr>
+      <td><code>emulation_faults</code></td>
+      <td>the count of emulation faults, that is when
+          the kernel traps on unimplemented instrucions
+          and emulates them for user space, by
+          applications running on the platform</td>
+      <td><code>perf.emulation_faults</code></td>
+    </tr>
   </table>
 
     <h3><a name="elementsDevices">Devices</a></h3>

docs/schemas/domaincommon.rng

@@ -441,6 +441,7 @@
               <value>page_faults_min</value>
               <value>page_faults_maj</value>
               <value>alignment_faults</value>
+              <value>emulation_faults</value>
             </choice>
           </attribute>
           <attribute name="enabled">