123 lines
5.2 KiB
Python
123 lines
5.2 KiB
Python
# 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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from oslo_log import log as logging
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from nova import objects
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from nova.objects import fields
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from nova.scheduler import filters
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from nova.virt import hardware
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LOG = logging.getLogger(__name__)
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class NUMATopologyFilter(filters.BaseHostFilter):
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"""Filter on requested NUMA topology."""
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# NOTE(sean-k-mooney): In change I0322d872bdff68936033a6f5a54e8296a6fb343
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# we validate that the NUMA topology does not change in the api. If the
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# requested image would alter the NUMA constraints we reject the rebuild
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# request and therefore do not need to run this filter on rebuild.
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RUN_ON_REBUILD = False
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def _satisfies_cpu_policy(self, host_state, extra_specs, image_props):
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"""Check that the host_state provided satisfies any available
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CPU policy requirements.
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"""
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host_topology = host_state.numa_topology
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# NOTE(stephenfin): There can be conflicts between the policy
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# specified by the image and that specified by the instance, but this
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# is not the place to resolve these. We do this during scheduling.
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cpu_policy = [extra_specs.get('hw:cpu_policy'),
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image_props.get('hw_cpu_policy')]
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cpu_thread_policy = [extra_specs.get('hw:cpu_thread_policy'),
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image_props.get('hw_cpu_thread_policy')]
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if not host_topology:
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return True
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if fields.CPUAllocationPolicy.DEDICATED not in cpu_policy:
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return True
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if fields.CPUThreadAllocationPolicy.REQUIRE not in cpu_thread_policy:
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return True
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if not host_topology.has_threads:
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LOG.debug("%(host_state)s fails CPU policy requirements. "
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"Host does not have hyperthreading or "
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"hyperthreading is disabled, but 'require' threads "
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"policy was requested.", {'host_state': host_state})
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return False
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return True
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def host_passes(self, host_state, spec_obj):
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# TODO(stephenfin): The 'numa_fit_instance_to_host' function has the
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# unfortunate side effect of modifying 'spec_obj.numa_topology' - an
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# InstanceNUMATopology object - by populating the 'cpu_pinning' field.
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# This is rather rude and said function should be reworked to avoid
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# doing this. That's a large, non-backportable cleanup however, so for
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# now we just duplicate spec_obj to prevent changes propagating to
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# future filter calls.
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spec_obj = spec_obj.obj_clone()
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ram_ratio = host_state.ram_allocation_ratio
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cpu_ratio = host_state.cpu_allocation_ratio
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extra_specs = spec_obj.flavor.extra_specs
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image_props = spec_obj.image.properties
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requested_topology = spec_obj.numa_topology
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host_topology = host_state.numa_topology
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pci_requests = spec_obj.pci_requests
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network_metadata = None
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if 'network_metadata' in spec_obj:
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network_metadata = spec_obj.network_metadata
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if pci_requests:
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pci_requests = pci_requests.requests
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if not self._satisfies_cpu_policy(host_state, extra_specs,
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image_props):
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return False
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if requested_topology and host_topology:
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limits = objects.NUMATopologyLimits(
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cpu_allocation_ratio=cpu_ratio,
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ram_allocation_ratio=ram_ratio)
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if network_metadata:
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limits.network_metadata = network_metadata
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instance_topology = (hardware.numa_fit_instance_to_host(
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host_topology, requested_topology,
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limits=limits,
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pci_requests=pci_requests,
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pci_stats=host_state.pci_stats))
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if not instance_topology:
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LOG.debug("%(host)s, %(node)s fails NUMA topology "
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"requirements. The instance does not fit on this "
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"host.", {'host': host_state.host,
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'node': host_state.nodename},
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instance_uuid=spec_obj.instance_uuid)
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return False
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host_state.limits['numa_topology'] = limits
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return True
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elif requested_topology:
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LOG.debug("%(host)s, %(node)s fails NUMA topology requirements. "
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"No host NUMA topology while the instance specified "
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"one.",
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{'host': host_state.host, 'node': host_state.nodename},
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instance_uuid=spec_obj.instance_uuid)
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return False
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else:
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return True
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