Implemented memallocratio 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', 'cpuallocratio', 'memalloc', 'memrunning', 'memremaining'):
+        for tag in ('cpualloc', 'cpurunning', 'cpuremaining', 'cpuallocratio', 'memalloc', 'memrunning', 'memremaining', 'memallocratio'):
             self.tag_db['__main__'][tag].update_value()
 
         # register libvirt handlers

cloudcontrol/node/hypervisor/tags.py

@@ -199,4 +199,12 @@ def memremaining(handl):
     """Allocatable memory remaining on the hypervisor."""
     mem = int(handl.tag_db['__main__']['mem'].value)
     memalloc = int(handl.tag_db['__main__']['memalloc'].value)
-    return mem - memalloc
\ No newline at end of file
+    return mem - memalloc
+
+
+@_check_virt_connected
+def memallocratio(handl):
+    """Allocated memory ratio on the hypervisor."""
+    mem = float(handl.tag_db['__main__']['mem'].value)
+    memalloc = float(handl.tag_db['__main__']['memalloc'].value)
+    return '%0.2f' % (memalloc / mem)
\ No newline at end of file