307 lines
11 KiB
Python
307 lines
11 KiB
Python
# Copyright (c) 2012 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Claim objects for use with resource tracking.
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"""
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from oslo_log import log as logging
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from nova import exception
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from nova.i18n import _
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from nova import objects
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from nova.virt import hardware
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LOG = logging.getLogger(__name__)
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class NopClaim(object):
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"""For use with compute drivers that do not support resource tracking."""
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def __init__(self, *args, **kwargs):
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self.migration = kwargs.pop('migration', None)
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self.claimed_numa_topology = None
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@property
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def disk_gb(self):
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return 0
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@property
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def memory_mb(self):
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return 0
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@property
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def vcpus(self):
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return 0
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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if exc_type is not None:
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self.abort()
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def abort(self):
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pass
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def __str__(self):
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return "[Claim: %d MB memory, %d GB disk]" % (self.memory_mb,
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self.disk_gb)
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class Claim(NopClaim):
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"""A declaration that a compute host operation will require free resources.
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Claims serve as marker objects that resources are being held until the
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update_available_resource audit process runs to do a full reconciliation
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of resource usage.
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This information will be used to help keep the local compute hosts's
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ComputeNode model in sync to aid the scheduler in making efficient / more
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correct decisions with respect to host selection.
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"""
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def __init__(self, context, instance, nodename, tracker, resources,
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pci_requests, overhead=None, limits=None):
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super(Claim, self).__init__()
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# Stash a copy of the instance at the current point of time
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self.instance = instance.obj_clone()
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self.nodename = nodename
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self._numa_topology_loaded = False
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self.tracker = tracker
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self._pci_requests = pci_requests
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if not overhead:
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overhead = {'memory_mb': 0,
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'disk_gb': 0}
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self.overhead = overhead
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self.context = context
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# Check claim at constructor to avoid mess code
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# Raise exception ComputeResourcesUnavailable if claim failed
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self._claim_test(resources, limits)
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@property
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def disk_gb(self):
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return (self.instance.flavor.root_gb +
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self.instance.flavor.ephemeral_gb +
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self.overhead.get('disk_gb', 0))
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@property
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def memory_mb(self):
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return self.instance.flavor.memory_mb + self.overhead['memory_mb']
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@property
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def vcpus(self):
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return self.instance.flavor.vcpus
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@property
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def numa_topology(self):
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if self._numa_topology_loaded:
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return self._numa_topology
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else:
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self._numa_topology = self.instance.numa_topology
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return self._numa_topology
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def abort(self):
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"""Compute operation requiring claimed resources has failed or
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been aborted.
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"""
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LOG.debug("Aborting claim: %s", self, instance=self.instance)
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self.tracker.abort_instance_claim(self.context, self.instance,
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self.nodename)
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def _claim_test(self, resources, limits=None):
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"""Test if this claim can be satisfied given available resources and
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optional oversubscription limits
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This should be called before the compute node actually consumes the
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resources required to execute the claim.
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:param resources: available local compute node resources
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:returns: Return true if resources are available to claim.
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"""
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if not limits:
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limits = {}
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# If an individual limit is None, the resource will be considered
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# unlimited:
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memory_mb_limit = limits.get('memory_mb')
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disk_gb_limit = limits.get('disk_gb')
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vcpus_limit = limits.get('vcpu')
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numa_topology_limit = limits.get('numa_topology')
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LOG.info("Attempting claim on node %(node)s: "
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"memory %(memory_mb)d MB, "
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"disk %(disk_gb)d GB, vcpus %(vcpus)d CPU",
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{'node': self.nodename, 'memory_mb': self.memory_mb,
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'disk_gb': self.disk_gb, 'vcpus': self.vcpus},
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instance=self.instance)
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reasons = [self._test_memory(resources, memory_mb_limit),
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self._test_disk(resources, disk_gb_limit),
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self._test_vcpus(resources, vcpus_limit),
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self._test_numa_topology(resources, numa_topology_limit),
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self._test_pci()]
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reasons = [r for r in reasons if r is not None]
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if len(reasons) > 0:
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raise exception.ComputeResourcesUnavailable(reason=
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"; ".join(reasons))
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LOG.info('Claim successful on node %s', self.nodename,
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instance=self.instance)
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def _test_memory(self, resources, limit):
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type_ = _("memory")
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unit = "MB"
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total = resources.memory_mb
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used = resources.memory_mb_used
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requested = self.memory_mb
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return self._test(type_, unit, total, used, requested, limit)
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def _test_disk(self, resources, limit):
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type_ = _("disk")
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unit = "GB"
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total = resources.local_gb
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used = resources.local_gb_used
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requested = self.disk_gb
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return self._test(type_, unit, total, used, requested, limit)
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def _test_vcpus(self, resources, limit):
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type_ = _("vcpu")
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unit = "VCPU"
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total = resources.vcpus
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used = resources.vcpus_used
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requested = self.vcpus
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return self._test(type_, unit, total, used, requested, limit)
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def _test_pci(self):
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pci_requests = self._pci_requests
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if pci_requests.requests:
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stats = self.tracker.pci_tracker.stats
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if not stats.support_requests(pci_requests.requests):
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return _('Claim pci failed')
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def _test_numa_topology(self, resources, limit):
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host_topology = (resources.numa_topology
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if 'numa_topology' in resources else None)
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requested_topology = self.numa_topology
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if host_topology:
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host_topology = objects.NUMATopology.obj_from_db_obj(
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host_topology)
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pci_requests = self._pci_requests
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pci_stats = None
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if pci_requests.requests:
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pci_stats = self.tracker.pci_tracker.stats
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instance_topology = (
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hardware.numa_fit_instance_to_host(
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host_topology, requested_topology,
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limits=limit,
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pci_requests=pci_requests.requests,
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pci_stats=pci_stats))
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if requested_topology and not instance_topology:
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if pci_requests.requests:
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return (_("Requested instance NUMA topology together with "
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"requested PCI devices cannot fit the given "
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"host NUMA topology"))
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else:
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return (_("Requested instance NUMA topology cannot fit "
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"the given host NUMA topology"))
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elif instance_topology:
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self.claimed_numa_topology = instance_topology
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def _test(self, type_, unit, total, used, requested, limit):
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"""Test if the given type of resource needed for a claim can be safely
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allocated.
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"""
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LOG.info('Total %(type)s: %(total)d %(unit)s, used: %(used).02f '
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'%(unit)s',
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{'type': type_, 'total': total, 'unit': unit, 'used': used},
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instance=self.instance)
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if limit is None:
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# treat resource as unlimited:
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LOG.info('%(type)s limit not specified, defaulting to unlimited',
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{'type': type_}, instance=self.instance)
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return
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free = limit - used
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# Oversubscribed resource policy info:
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LOG.info('%(type)s limit: %(limit).02f %(unit)s, '
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'free: %(free).02f %(unit)s',
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{'type': type_, 'limit': limit, 'free': free, 'unit': unit},
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instance=self.instance)
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if requested > free:
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return (_('Free %(type)s %(free).02f '
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'%(unit)s < requested %(requested)d %(unit)s') %
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{'type': type_, 'free': free, 'unit': unit,
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'requested': requested})
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class MoveClaim(Claim):
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"""Claim used for holding resources for an incoming move operation.
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Move can be either a migrate/resize, live-migrate or an evacuate operation.
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"""
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def __init__(self, context, instance, nodename, instance_type, image_meta,
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tracker, resources, pci_requests, overhead=None, limits=None):
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self.context = context
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self.instance_type = instance_type
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if isinstance(image_meta, dict):
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image_meta = objects.ImageMeta.from_dict(image_meta)
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self.image_meta = image_meta
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super(MoveClaim, self).__init__(context, instance, nodename, tracker,
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resources, pci_requests,
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overhead=overhead, limits=limits)
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self.migration = None
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@property
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def disk_gb(self):
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return (self.instance_type.root_gb +
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self.instance_type.ephemeral_gb +
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self.overhead.get('disk_gb', 0))
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@property
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def memory_mb(self):
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return self.instance_type.memory_mb + self.overhead['memory_mb']
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@property
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def vcpus(self):
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return self.instance_type.vcpus
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@property
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def numa_topology(self):
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return hardware.numa_get_constraints(self.instance_type,
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self.image_meta)
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def abort(self):
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"""Compute operation requiring claimed resources has failed or
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been aborted.
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"""
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LOG.debug("Aborting claim: %s", self, instance=self.instance)
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self.tracker.drop_move_claim(
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self.context,
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self.instance, self.nodename,
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instance_type=self.instance_type)
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self.instance.drop_migration_context()
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