94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
# Copyright (c) 2011 OpenStack Foundation
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# Copyright (c) 2012 Cloudscaling
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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 BaseRamFilter(filters.BaseHostFilter):
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RUN_ON_REBUILD = False
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def _get_ram_allocation_ratio(self, host_state, spec_obj):
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raise NotImplementedError
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def host_passes(self, host_state, spec_obj):
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"""Only return hosts with sufficient available RAM."""
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requested_ram = spec_obj.memory_mb
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free_ram_mb = host_state.free_ram_mb
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total_usable_ram_mb = host_state.total_usable_ram_mb
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# Do not allow an instance to overcommit against itself, only against
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# other instances.
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if not total_usable_ram_mb >= requested_ram:
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LOG.debug("%(host_state)s does not have %(requested_ram)s MB "
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"usable ram before overcommit, it only has "
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"%(usable_ram)s MB.",
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{'host_state': host_state,
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'requested_ram': requested_ram,
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'usable_ram': total_usable_ram_mb})
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return False
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ram_allocation_ratio = self._get_ram_allocation_ratio(host_state,
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spec_obj)
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memory_mb_limit = total_usable_ram_mb * ram_allocation_ratio
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used_ram_mb = total_usable_ram_mb - free_ram_mb
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usable_ram = memory_mb_limit - used_ram_mb
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if not usable_ram >= requested_ram:
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LOG.debug("%(host_state)s does not have %(requested_ram)s MB "
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"usable ram, it only has %(usable_ram)s MB usable ram.",
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{'host_state': host_state,
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'requested_ram': requested_ram,
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'usable_ram': usable_ram})
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return False
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# save oversubscription limit for compute node to test against:
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host_state.limits['memory_mb'] = memory_mb_limit
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return True
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class RamFilter(BaseRamFilter):
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"""Ram Filter with over subscription flag."""
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def _get_ram_allocation_ratio(self, host_state, spec_obj):
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return host_state.ram_allocation_ratio
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class AggregateRamFilter(BaseRamFilter):
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"""AggregateRamFilter with per-aggregate ram subscription flag.
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Fall back to global ram_allocation_ratio if no per-aggregate setting found.
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"""
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def _get_ram_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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'ram_allocation_ratio')
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try:
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ratio = utils.validate_num_values(
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aggregate_vals, host_state.ram_allocation_ratio, cast_to=float)
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except ValueError as e:
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LOG.warning("Could not decode ram_allocation_ratio: '%s'", e)
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ratio = host_state.ram_allocation_ratio
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return ratio
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