Adds memory stats meter to libvirt inspector
Uses libvirt 'virDomainMemoryStats' to retrive the memory that is used by domain, implements 'inspect_memory_usage' function in libvirt inspector. Change-Id: I5bf17d51d82d10d2f31b9c81583f53b81c1c5268 Implements: blueprint libvirt-memory-utilization-inspector
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kiwik-chenrui
parent
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commit
135961088d
@ -18,8 +18,10 @@
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from lxml import etree
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from oslo.config import cfg
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from oslo.utils import units
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import six
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from ceilometer.compute.pollsters import util
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from ceilometer.compute.virt import inspector as virt_inspector
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from ceilometer.openstack.common.gettextutils import _
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from ceilometer.openstack.common import log as logging
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@ -178,3 +180,35 @@ class LibvirtInspector(virt_inspector.Inspector):
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write_bytes=block_stats[3],
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errors=block_stats[4])
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yield (disk, stats)
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def inspect_memory_usage(self, instance, duration=None):
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instance_name = util.instance_name(instance)
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domain = self._lookup_by_name(instance_name)
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state = domain.info()[0]
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if state == libvirt.VIR_DOMAIN_SHUTOFF:
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LOG.warn(_('Failed to inspect memory usage of %(instance_name)s, '
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'domain is in state of SHUTOFF'),
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{'instance_name': instance_name})
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return
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try:
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memory_stats = domain.memoryStats()
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if (memory_stats and
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memory_stats.get('available') and
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memory_stats.get('unused')):
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memory_used = (memory_stats.get('available') -
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memory_stats.get('unused'))
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# Stat provided from libvirt is in KB, converting it to MB.
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memory_used = memory_used / units.Ki
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return virt_inspector.MemoryUsageStats(usage=memory_used)
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else:
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LOG.warn(_('Failed to inspect memory usage of '
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'%(instance_name)s, can not get info from libvirt'),
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{'instance_name': instance_name})
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# memoryStats might launch an exception if the method
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# is not supported by the underlying hypervisor being
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# used by libvirt
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except libvirt.libvirtError as e:
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LOG.warn(_('Failed to inspect memory usage of %(instance_name)s, '
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'can not get info from libvirt: %(error)s'),
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{'instance_name': instance_name, 'error': e})
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@ -22,6 +22,7 @@ import contextlib
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import fixtures
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import mock
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from oslo.utils import units
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from oslotest import base
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from ceilometer.compute.virt import inspector as virt_inspector
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@ -245,6 +246,44 @@ class TestLibvirtInspection(base.BaseTestCase):
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disks = list(self.inspector.inspect_disks(self.instance_name))
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self.assertEqual(disks, [])
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def test_inspect_memory_usage(self):
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fake_memory_stats = {'available': 51200L, 'unused': 25600L}
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connection = self.inspector.connection
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with mock.patch.object(connection, 'lookupByName',
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return_value=self.domain):
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with mock.patch.object(self.domain, 'info',
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return_value=(0L, 0L, 51200L,
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2L, 999999L)):
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with mock.patch.object(self.domain, 'memoryStats',
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return_value=fake_memory_stats):
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memory = self.inspector.inspect_memory_usage(
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self.instance_name)
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self.assertEqual(25600L / units.Ki, memory.usage)
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def test_inspect_memory_usage_with_domain_shutoff(self):
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connection = self.inspector.connection
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with mock.patch.object(connection, 'lookupByName',
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return_value=self.domain):
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with mock.patch.object(self.domain, 'info',
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return_value=(5L, 0L, 0L,
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2L, 999999L)):
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memory = self.inspector.inspect_memory_usage(
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self.instance_name)
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self.assertIsNone(memory)
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def test_inspect_memory_usage_with_empty_stats(self):
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connection = self.inspector.connection
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with mock.patch.object(connection, 'lookupByName',
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return_value=self.domain):
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with mock.patch.object(self.domain, 'info',
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return_value=(0L, 0L, 51200L,
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2L, 999999L)):
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with mock.patch.object(self.domain, 'memoryStats',
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return_value={}):
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memory = self.inspector.inspect_memory_usage(
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self.instance_name)
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self.assertIsNone(memory)
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class TestLibvirtInspectionWithError(base.BaseTestCase):
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@ -71,7 +71,7 @@ Name Type* Unit Resource Origin** Support**
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instance g instance inst ID both 1, 2, 3, 4 Existence of instance
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instance:<type> g instance inst ID both 1, 2, 3, 4 Existence of instance <type> (openstack types)
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memory g MB inst ID n 1, 2 Volume of RAM allocated in MB
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memory.usage g MB inst ID p 3, 4 Volume of RAM used in MB
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memory.usage g MB inst ID p 1, 3, 4 Volume of RAM used in MB
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cpu c ns inst ID p 1, 2 CPU time used
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cpu_util g % inst ID p 1, 2, 3, 4 Average CPU utilisation
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vcpus g vcpu inst ID n 1, 2 Number of VCPUs
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@ -118,6 +118,12 @@ network.outgoing.packets.rate g packet/s iface ID p 1, 2, 3,
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[3]: Vsphere support
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[4]: XenAPI support
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.. note:: To enable the libvirt memory.usage supporting, you need libvirt
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version 1.1.1+, qemu version 1.5+, and you need to prepare suitable balloon
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driver in the image, particularly for Windows guests, most modern Linuxes
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have it built in. The memory.usage meters can't be fetched without image
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balloon driver.
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Contributors are welcome to extend other virtualization backends' meters
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or complete the existing ones.
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