54 lines
2.0 KiB
Python
54 lines
2.0 KiB
Python
# Copyright (c) 2011 OpenStack, LLC.
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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 nova import flags
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from nova.openstack.common import cfg
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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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LOG = logging.getLogger(__name__)
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ram_allocation_ratio_opt = cfg.FloatOpt("ram_allocation_ratio",
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default=1.5,
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help="virtual ram to physical ram allocation ratio")
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FLAGS = flags.FLAGS
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FLAGS.register_opt(ram_allocation_ratio_opt)
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class RamFilter(filters.BaseHostFilter):
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"""Ram Filter with over subscription flag"""
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def host_passes(self, host_state, filter_properties):
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"""Only return hosts with sufficient available RAM."""
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instance_type = filter_properties.get('instance_type')
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requested_ram = instance_type['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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memory_mb_limit = total_usable_ram_mb * FLAGS.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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locals())
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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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