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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', {})
instance_topology = hardware.instance_topology_from_instance(instance)
host_topology, _fmt = hardware.host_topology_and_format_from_host(
host_state)
if instance_topology:
if host_topology:
if not hardware.VirtNUMAHostTopology.can_fit_instances(
host_topology, [instance_topology]):
return False
limit_cells = []
usage_after_instance = (
hardware.VirtNUMAHostTopology.usage_from_instances(
host_topology, [instance_topology]))
for cell in usage_after_instance.cells:
max_cell_memory = int(cell.memory * ram_ratio)
max_cell_cpu = len(cell.cpuset) * cpu_ratio
if (cell.memory_usage > max_cell_memory or
cell.cpu_usage > max_cell_cpu):
return False
limit_cells.append(
hardware.VirtNUMATopologyCellLimit(
cell.id, cell.cpuset, cell.memory,
max_cell_cpu, max_cell_memory))
host_state.limits['numa_topology'] = (
hardware.VirtNUMALimitTopology(
cells=limit_cells).to_json())
return True
else:
return False
else:
return True
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