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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from oslo.config import cfg
from nova.scheduler import filters
from nova.virt import hardware
CONF = cfg.CONF
CONF.import_opt('cpu_allocation_ratio', 'nova.scheduler.filters.core_filter')
CONF.import_opt('ram_allocation_ratio', 'nova.scheduler.filters.ram_filter')
class NUMATopologyFilter(filters.BaseHostFilter):
"""Filter on requested NUMA topology."""
def host_passes(self, host_state, filter_properties):
ram_ratio = CONF.ram_allocation_ratio
cpu_ratio = CONF.cpu_allocation_ratio
request_spec = filter_properties.get('request_spec', {})
instance = request_spec.get('instance_properties', {})
requested_topology = hardware.instance_topology_from_instance(instance)
host_topology, _fmt = hardware.host_topology_and_format_from_host(
host_state)
if requested_topology and host_topology:
limit_cells = []
for cell in host_topology.cells:
max_cell_memory = int(cell.memory * ram_ratio)
max_cell_cpu = len(cell.cpuset) * cpu_ratio
limit_cells.append(hardware.VirtNUMATopologyCellLimit(
cell.id, cell.cpuset, cell.memory,
max_cell_cpu, max_cell_memory))
limits = hardware.VirtNUMALimitTopology(cells=limit_cells)
instance_topology = (
hardware.VirtNUMAHostTopology.fit_instance_to_host(
host_topology, requested_topology,
limits_topology=limits))
if not instance_topology:
return False
host_state.limits['numa_topology'] = limits.to_json()
instance['numa_topology'] = instance_topology.to_json()
return True
elif requested_topology:
return False
else:
return True
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