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@mgagne
Created April 30, 2018 16:29
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RAM weigher for Nova - Mitaka
# 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_log import log as logging
import nova.conf
from nova.i18n import _LW
from nova.scheduler.filters import utils
from nova.scheduler import weights
CONF = nova.conf.CONF
LOG = logging.getLogger(__name__)
class AggregateRAMWeigher(weights.BaseHostWeigher):
"""AggregateRAMWeigher with per-aggregate RAM weight multiplier.
Fallback to global ram_weight_multiplier if no per-aggregate setting found.
"""
def _weigh_object(self, host_state, weight_properties):
aggregate_vals = utils.aggregate_values_from_key(
host_state,
'ram_weight_multiplier')
try:
weight = utils.validate_num_values(
aggregate_vals,
CONF.ram_weight_multiplier, cast_to=float)
except ValueError as e:
LOG.warning(_LW("Could not decode ram_weight_multiplier: '%s'"), e)
weight = CONF.ram_weight_multiplier
return host_state.free_ram_mb * weight
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