82 lines
3.3 KiB
Python
82 lines
3.3 KiB
Python
# Copyright (c) 2011-2012 OpenStack Foundation
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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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import copy
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from oslo_log import log as logging
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from nova.i18n import _
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from nova_solverscheduler.scheduler.solvers import constraints
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LOG = logging.getLogger(__name__)
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class PciPassthroughConstraint(constraints.BaseLinearConstraint):
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"""Constraint that schedules instances on a host if the host has devices
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to meet the device requests in the 'extra_specs' for the flavor.
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PCI resource tracker provides updated summary information about the
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PCI devices for each host, like:
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[{"count": 5, "vendor_id": "8086", "product_id": "1520",
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"extra_info":'{}'}],
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and VM requests PCI devices via PCI requests, like:
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[{"count": 1, "vendor_id": "8086", "product_id": "1520",}].
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The constraint checks if the host passes or not based on this information.
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"""
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def _get_acceptable_pci_requests_times(self, max_times_to_try,
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pci_requests, host_pci_stats):
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acceptable_times = 0
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while acceptable_times < max_times_to_try:
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if host_pci_stats.support_requests(pci_requests):
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acceptable_times += 1
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host_pci_stats.apply_requests(pci_requests)
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else:
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break
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return acceptable_times
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def get_constraint_matrix(self, hosts, filter_properties):
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num_hosts = len(hosts)
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num_instances = filter_properties.get('num_instances')
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constraint_matrix = [[True for j in xrange(num_instances)]
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for i in xrange(num_hosts)]
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pci_requests = filter_properties.get('pci_requests')
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if not pci_requests:
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LOG.warn(_("PciPassthroughConstraint check is skipped because "
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"requested instance PCI requests is unavailable."))
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return constraint_matrix
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for i in xrange(num_hosts):
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host_pci_stats = copy.deepcopy(hosts[i].pci_stats)
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acceptable_num_instances = (
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self._get_acceptable_pci_requests_times(num_instances,
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pci_requests, host_pci_stats))
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if acceptable_num_instances < num_instances:
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inacceptable_num = num_instances - acceptable_num_instances
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constraint_matrix[i] = (
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[True for j in xrange(acceptable_num_instances)] +
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[False for j in xrange(inacceptable_num)])
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LOG.debug(_("%(host)s can accept %(num)s requested instances "
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"according to PciPassthroughConstraint."),
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{'host': hosts[i],
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'num': acceptable_num_instances})
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return constraint_matrix
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