Implemented cpuallocratio tag

cloudcontrol/node/hypervisor/__init__.py

@@ -125,7 +125,7 @@ class Handler(HostHandler):
 
         # we must refresh those tags only when domains tags are registered to
         # have the calculated values
-        for tag in ('cpualloc', 'cpurunning', 'cpuremaining', 'memalloc', 'memrunning', 'memremaining'):
+        for tag in ('cpualloc', 'cpurunning', 'cpuremaining', 'cpuallocratio', 'memalloc', 'memrunning', 'memremaining'):
             self.tag_db['__main__'][tag].update_value()
 
         # register libvirt handlers

cloudcontrol/node/hypervisor/tags.py

@@ -171,6 +171,14 @@ def cpuremaining(handl):
     return cpu - cpualloc
 
 
+@_check_virt_connected
+def cpuallocratio(handl):
+    """Allocated CPU ratio on the hypervisor."""
+    cpu = float(handl.tag_db['__main__']['cpu'].value)
+    cpualloc = float(handl.tag_db['__main__']['cpualloc'].value)
+    return '%0.2f' % (cpualloc / cpu)
+
+
 @_check_virt_connected
 def memrunning(handl):
     """Memory used by running VMs on the hypervisor."""