Implemented cpuuse tag for VMs.

cloudcontrol/node/hypervisor/domains/__init__.py

@@ -56,6 +56,9 @@ class VirtualMachine(object):
 
         logger.debug('Virtual Machine tags: %s', self.tags)
 
+        #: keep record of CPU stats (libev timestamp, cpu time)
+        self.cpu_stats = (hypervisor.handler.main.evloop.now(), dom.info()[4])
+
     @property
     def state(self):
         return self._state

cloudcontrol/node/hypervisor/domains/vm_tags.py

@@ -76,8 +76,17 @@ def cpu(dom):
 
 @ttl(10)
 @refresh(5)
-def cpuuse():
-    pass
+@_vir_tag
+def cpuuse(dom):
+    """Represent CPU use in percent average on 5 seconds."""
+    state, _, _, vcpu, cpu_time = dom.lv_dom.info()
+    if state != 1:  # if VM is not running
+        return None
+    old_cpu_stats = dom.cpu_stats
+    dom.cpu_stats = (dom.hypervisor.handler.main.evloop.now(), cpu_time)
+    # calculate CPU percentage
+    return '%.2f' % max(0., min(100., ((cpu_time - old_cpu_stats[1]) * 100.) / (
+        (dom.cpu_stats[0] - old_cpu_stats[0]) * 1000. * 1000. * 1000.)))
 
 
 @_vir_tag