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