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# Copyright (c) 2011 OpenStack Foundation
# Copyright (c) 2012 Justin Santa Barbara
#
# All Rights Reserved.
#
# 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 import db
from nova.openstack.common import log as logging
from nova.scheduler import filters
LOG = logging.getLogger(__name__)
cpu_allocation_ratio_opt = cfg.FloatOpt('cpu_allocation_ratio',
default=16.0,
help='Virtual CPU to physical CPU allocation ratio which affects '
'all CPU filters. This configuration specifies a global ratio '
'for CoreFilter. For AggregateCoreFilter, it will fall back to '
'this configuration value if no per-aggregate setting found.')
CONF = cfg.CONF
CONF.register_opt(cpu_allocation_ratio_opt)
class BaseCoreFilter(filters.BaseHostFilter):
def _get_cpu_allocation_ratio(self, host_state, filter_properties):
raise NotImplementedError
def host_passes(self, host_state, filter_properties):
"""Return True if host has sufficient CPU cores."""
instance_type = filter_properties.get('instance_type')
if not instance_type:
return True
if not host_state.vcpus_total:
# Fail safe
LOG.warning(_("VCPUs not set; assuming CPU collection broken"))
return True
instance_vcpus = instance_type['vcpus']
cpu_allocation_ratio = self._get_cpu_allocation_ratio(host_state,
filter_properties)
vcpus_total = host_state.vcpus_total * cpu_allocation_ratio
# Only provide a VCPU limit to compute if the virt driver is reporting
# an accurate count of installed VCPUs. (XenServer driver does not)
if vcpus_total > 0:
host_state.limits['vcpu'] = vcpus_total
return (vcpus_total - host_state.vcpus_used) >= instance_vcpus
class CoreFilter(BaseCoreFilter):
"""CoreFilter filters based on CPU core utilization."""
def _get_cpu_allocation_ratio(self, host_state, filter_properties):
return CONF.cpu_allocation_ratio
class AggregateCoreFilter(BaseCoreFilter):
"""AggregateRamFilter with per-aggregate CPU subscription flag.
Fall back to global cpu_allocation_ratio if no per-aggregate setting found.
"""
def _get_cpu_allocation_ratio(self, host_state, filter_properties):
context = filter_properties['context'].elevated()
# TODO(uni): DB query in filter is a performance hit, especially for
# system with lots of hosts. Will need a general solution here to fix
# all filters with aggregate DB call things.
metadata = db.aggregate_metadata_get_by_host(
context, host_state.host, key='cpu_allocation_ratio')
aggregate_vals = metadata.get('cpu_allocation_ratio', set())
num_values = len(aggregate_vals)
if num_values == 0:
return CONF.cpu_allocation_ratio
if num_values > 1:
LOG.warning(_("%(num_values)d ratio values found, "
"of which the minimum value will be used."),
{'num_values': num_values})
try:
ratio = float(min(aggregate_vals))
except ValueError as e:
LOG.warning(_("Could not decode cpu_allocation_ratio: "
"'%(e)s'") % locals())
ratio = CONF.cpu_allocation_ratio
return ratio
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