70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
# 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."""
|
|
|
|
def _get_max_io_ops_per_host(self, host_state, spec_obj):
|
|
return CONF.filter_scheduler.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):
|
|
max_io_ops_per_host = CONF.filter_scheduler.max_io_ops_per_host
|
|
aggregate_vals = utils.aggregate_values_from_key(
|
|
host_state,
|
|
'max_io_ops_per_host')
|
|
|
|
try:
|
|
value = utils.validate_num_values(
|
|
aggregate_vals, 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 = max_io_ops_per_host
|
|
|
|
return value
|