80 lines
3.0 KiB
Python
80 lines
3.0 KiB
Python
# Copyright (c) 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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from oslo.config import cfg
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from nova.i18n import _LW
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from nova.openstack.common import log as logging
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from nova.scheduler import filters
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from nova.scheduler.filters import utils
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LOG = logging.getLogger(__name__)
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max_io_ops_per_host_opt = cfg.IntOpt("max_io_ops_per_host",
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default=8,
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help="Tells filters to ignore hosts that have "
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"this many or more instances currently in "
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"build, resize, snapshot, migrate, rescue or unshelve "
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"task states")
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CONF = cfg.CONF
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CONF.register_opt(max_io_ops_per_host_opt)
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class IoOpsFilter(filters.BaseHostFilter):
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"""Filter out hosts with too many concurrent I/O operations."""
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def _get_max_io_ops_per_host(self, host_state, filter_properties):
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return CONF.max_io_ops_per_host
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def host_passes(self, host_state, filter_properties):
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"""Use information about current vm and task states collected from
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compute node statistics to decide whether to filter.
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"""
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num_io_ops = host_state.num_io_ops
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max_io_ops = self._get_max_io_ops_per_host(
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host_state, filter_properties)
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passes = num_io_ops < max_io_ops
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if not passes:
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LOG.debug("%(host_state)s fails I/O ops check: Max IOs per host "
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"is set to %(max_io_ops)s",
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{'host_state': host_state,
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'max_io_ops': max_io_ops})
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return passes
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class AggregateIoOpsFilter(IoOpsFilter):
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"""AggregateIoOpsFilter with per-aggregate the max io operations.
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Fall back to global max_io_ops_per_host if no per-aggregate setting found.
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"""
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def _get_max_io_ops_per_host(self, host_state, filter_properties):
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# TODO(uni): DB query in filter is a performance hit, especially for
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# system with lots of hosts. Will need a general solution here to fix
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# all filters with aggregate DB call things.
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aggregate_vals = utils.aggregate_values_from_db(
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filter_properties['context'],
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host_state.host,
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'max_io_ops_per_host')
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try:
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value = utils.validate_num_values(
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aggregate_vals, CONF.max_io_ops_per_host, cast_to=int)
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except ValueError as e:
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LOG.warn(_LW("Could not decode max_io_ops_per_host: '%s'"), e)
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value = CONF.max_io_ops_per_host
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return value
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