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# Copyright (c) 2012 OpenStack Foundation
# 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 import filters
from nova.scheduler.filters import utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
class IoOpsFilter(filters.BaseHostFilter):
"""Filter out hosts with too many concurrent I/O operations."""
RUN_ON_REBUILD = False
def _get_max_io_ops_per_host(self, host_state, spec_obj):
return CONF.max_io_ops_per_host
def host_passes(self, host_state, spec_obj):
"""Use information about current vm and task states collected from
compute node statistics to decide whether to filter.
"""
num_io_ops = host_state.num_io_ops
max_io_ops = self._get_max_io_ops_per_host(
host_state, spec_obj)
passes = num_io_ops < max_io_ops
if not passes:
LOG.debug("%(host_state)s fails I/O ops check: Max IOs per host "
"is set to %(max_io_ops)s",
{'host_state': host_state,
'max_io_ops': max_io_ops})
return passes
class AggregateIoOpsFilter(IoOpsFilter):
"""AggregateIoOpsFilter with per-aggregate the max io operations.
Fall back to global max_io_ops_per_host if no per-aggregate setting found.
"""
def _get_max_io_ops_per_host(self, host_state, spec_obj):
aggregate_vals = utils.aggregate_values_from_key(
host_state,
'max_io_ops_per_host')
try:
value = utils.validate_num_values(
aggregate_vals, CONF.max_io_ops_per_host, cast_to=int)
except ValueError as e:
LOG.warning(_LW("Could not decode max_io_ops_per_host: '%s'"), e)
value = CONF.max_io_ops_per_host
return value
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