57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
# Copyright (c) 2011 OpenStack, LLC.
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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 nova import flags
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova.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')
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FLAGS = flags.FLAGS
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FLAGS.register_opt(cpu_allocation_ratio_opt)
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class CoreFilter(filters.BaseHostFilter):
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"""CoreFilter filters based on CPU core utilization."""
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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 host_state.topic != 'compute' or 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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vcpus_total = host_state.vcpus_total * FLAGS.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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