85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
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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_log import log as logging
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from nova.compute.resources import base
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LOG = logging.getLogger(__name__)
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class VCPU(base.Resource):
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"""VCPU compute resource plugin.
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This is effectively a simple counter based on the vcpu requirement of each
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instance.
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"""
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def __init__(self):
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# initialize to a 'zero' resource.
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# reset will be called to set real resource values
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self._total = 0
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self._used = 0
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def reset(self, resources, driver):
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# total vcpu is reset to the value taken from resources.
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self._total = int(resources['vcpus'])
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self._used = 0
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def _get_requested(self, usage):
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return int(usage.get('vcpus', 0))
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def _get_limit(self, limits):
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if limits and 'vcpu' in limits:
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return int(limits.get('vcpu'))
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def test(self, usage, limits):
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requested = self._get_requested(usage)
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limit = self._get_limit(limits)
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LOG.debug('Total CPUs: %(total)d VCPUs, used: %(used).02f VCPUs' %
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{'total': self._total, 'used': self._used})
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if limit is None:
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# treat resource as unlimited:
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LOG.debug('CPUs limit not specified, defaulting to unlimited')
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return
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free = limit - self._used
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# Oversubscribed resource policy info:
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LOG.debug('CPUs limit: %(limit).02f VCPUs, free: %(free).02f VCPUs' %
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{'limit': limit, 'free': free})
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if requested > free:
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return ('Free CPUs %(free).02f VCPUs < '
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'requested %(requested)d VCPUs' %
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{'free': free, 'requested': requested})
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def add_instance(self, usage):
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requested = int(usage.get('vcpus', 0))
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self._used += requested
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def remove_instance(self, usage):
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requested = int(usage.get('vcpus', 0))
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self._used -= requested
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def write(self, resources):
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resources['vcpus'] = self._total
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resources['vcpus_used'] = self._used
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def report_free(self):
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free_vcpus = self._total - self._used
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LOG.debug('Free VCPUs: %s' % free_vcpus)
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