96 lines
3.6 KiB
Python
96 lines
3.6 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_log 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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class DiskFilter(filters.BaseHostFilter):
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"""Disk Filter with over subscription flag."""
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RUN_ON_REBUILD = False
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def _get_disk_allocation_ratio(self, host_state, spec_obj):
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return host_state.disk_allocation_ratio
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def host_passes(self, host_state, spec_obj):
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"""Filter based on disk usage."""
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requested_disk = (1024 * (spec_obj.root_gb +
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spec_obj.ephemeral_gb) +
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spec_obj.swap)
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free_disk_mb = host_state.free_disk_mb
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total_usable_disk_mb = host_state.total_usable_disk_gb * 1024
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# Do not allow an instance to overcommit against itself, only against
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# other instances. In other words, if there isn't room for even just
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# this one instance in total_usable_disk space, consider the host full.
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if total_usable_disk_mb < requested_disk:
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LOG.debug("%(host_state)s does not have %(requested_disk)s "
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"MB usable disk space before overcommit, it only "
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"has %(physical_disk_size)s MB.",
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{'host_state': host_state,
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'requested_disk': requested_disk,
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'physical_disk_size':
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total_usable_disk_mb})
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return False
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disk_allocation_ratio = self._get_disk_allocation_ratio(
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host_state, spec_obj)
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disk_mb_limit = total_usable_disk_mb * disk_allocation_ratio
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used_disk_mb = total_usable_disk_mb - free_disk_mb
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usable_disk_mb = disk_mb_limit - used_disk_mb
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if not usable_disk_mb >= requested_disk:
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LOG.debug("%(host_state)s does not have %(requested_disk)s MB "
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"usable disk, it only has %(usable_disk_mb)s MB usable "
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"disk.", {'host_state': host_state,
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'requested_disk': requested_disk,
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'usable_disk_mb': usable_disk_mb})
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return False
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disk_gb_limit = disk_mb_limit / 1024
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host_state.limits['disk_gb'] = disk_gb_limit
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return True
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class AggregateDiskFilter(DiskFilter):
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"""AggregateDiskFilter with per-aggregate disk allocation ratio flag.
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Fall back to global disk_allocation_ratio if no per-aggregate setting
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found.
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"""
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RUN_ON_REBUILD = False
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def _get_disk_allocation_ratio(self, host_state, spec_obj):
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aggregate_vals = utils.aggregate_values_from_key(
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host_state,
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'disk_allocation_ratio')
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try:
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ratio = utils.validate_num_values(
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aggregate_vals, host_state.disk_allocation_ratio,
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cast_to=float)
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except ValueError as e:
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LOG.warning("Could not decode disk_allocation_ratio: '%s'", e)
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ratio = host_state.disk_allocation_ratio
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return ratio
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