221 lines
7.0 KiB
Python
221 lines
7.0 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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"""
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Claim objects for use with resource tracking.
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"""
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from nova.openstack.common import jsonutils
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from nova.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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class NopClaim(object):
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"""For use with compute drivers that do not support resource tracking."""
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def __init__(self, migration=None):
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self.migration = migration
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@property
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def disk_gb(self):
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return 0
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@property
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def memory_mb(self):
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return 0
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@property
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def vcpus(self):
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return 0
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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if exc_type is not None:
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self.abort()
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def abort(self):
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pass
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def __str__(self):
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return "[Claim: %d MB memory, %d GB disk, %d VCPUS]" % (self.memory_mb,
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self.disk_gb, self.vcpus)
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class Claim(NopClaim):
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"""A declaration that a compute host operation will require free resources.
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Claims serve as marker objects that resources are being held until the
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update_available_resource audit process runs to do a full reconciliation
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of resource usage.
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This information will be used to help keep the local compute hosts's
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ComputeNode model in sync to aid the scheduler in making efficient / more
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correct decisions with respect to host selection.
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"""
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def __init__(self, instance, tracker):
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super(Claim, self).__init__()
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self.instance = jsonutils.to_primitive(instance)
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self.tracker = tracker
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@property
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def disk_gb(self):
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return self.instance['root_gb'] + self.instance['ephemeral_gb']
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@property
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def memory_mb(self):
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return self.instance['memory_mb']
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@property
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def vcpus(self):
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return self.instance['vcpus']
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def abort(self):
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"""Compute operation requiring claimed resources has failed or
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been aborted.
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"""
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LOG.debug(_("Aborting claim: %s") % self, instance=self.instance)
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self.tracker.abort_instance_claim(self.instance)
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def test(self, resources, limits=None):
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"""Test if this claim can be satisfied given available resources and
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optional oversubscription limits
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This should be called before the compute node actually consumes the
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resources required to execute the claim.
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:param resources: available local compute node resources
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:returns: Return true if resources are available to claim.
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"""
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if not limits:
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limits = {}
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# If an individual limit is None, the resource will be considered
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# unlimited:
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memory_mb_limit = limits.get('memory_mb')
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disk_gb_limit = limits.get('disk_gb')
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vcpu_limit = limits.get('vcpu')
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msg = _("Attempting claim: memory %(memory_mb)d MB, disk %(disk_gb)d "
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"GB, VCPUs %(vcpus)d")
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params = {'memory_mb': self.memory_mb, 'disk_gb': self.disk_gb,
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'vcpus': self.vcpus}
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LOG.audit(msg % params, instance=self.instance)
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# Test for resources:
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can_claim = (self._test_memory(resources, memory_mb_limit) and
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self._test_disk(resources, disk_gb_limit) and
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self._test_cpu(resources, vcpu_limit))
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if can_claim:
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LOG.audit(_("Claim successful"), instance=self.instance)
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else:
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LOG.audit(_("Claim failed"), instance=self.instance)
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return can_claim
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def _test_memory(self, resources, limit):
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type_ = _("Memory")
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unit = "MB"
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total = resources['memory_mb']
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used = resources['memory_mb_used']
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requested = self.memory_mb
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return self._test(type_, unit, total, used, requested, limit)
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def _test_disk(self, resources, limit):
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type_ = _("Disk")
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unit = "GB"
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total = resources['local_gb']
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used = resources['local_gb_used']
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requested = self.disk_gb
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return self._test(type_, unit, total, used, requested, limit)
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def _test_cpu(self, resources, limit):
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type_ = _("CPU")
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unit = "VCPUs"
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total = resources['vcpus']
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used = resources['vcpus_used']
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requested = self.vcpus
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return self._test(type_, unit, total, used, requested, limit)
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def _test(self, type_, unit, total, used, requested, limit):
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"""Test if the given type of resource needed for a claim can be safely
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allocated.
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"""
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LOG.audit(_('Total %(type)s: %(total)d %(unit)s, used: %(used).02f '
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'%(unit)s'),
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{'type': type_, 'total': total, 'unit': unit, 'used': used},
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instance=self.instance)
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if limit is None:
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# treat resource as unlimited:
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LOG.audit(_('%(type)s limit not specified, defaulting to '
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'unlimited'), {'type': type_}, instance=self.instance)
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return True
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free = limit - used
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# Oversubscribed resource policy info:
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LOG.audit(_('%(type)s limit: %(limit).02f %(unit)s, free: %(free).02f '
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'%(unit)s'),
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{'type': type_, 'limit': limit, 'free': free, 'unit': unit},
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instance=self.instance)
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can_claim = requested <= free
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if not can_claim:
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LOG.info(_('Unable to claim resources. Free %(type)s %(free).02f '
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'%(unit)s < requested %(requested)d %(unit)s'),
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{'type': type_, 'free': free, 'unit': unit,
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'requested': requested},
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instance=self.instance)
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return can_claim
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class ResizeClaim(Claim):
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"""Claim used for holding resources for an incoming resize/migration
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operation.
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"""
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def __init__(self, instance, instance_type, tracker):
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super(ResizeClaim, self).__init__(instance, tracker)
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self.instance_type = instance_type
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self.migration = None
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@property
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def disk_gb(self):
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return (self.instance_type['root_gb'] +
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self.instance_type['ephemeral_gb'])
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@property
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def memory_mb(self):
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return self.instance_type['memory_mb']
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@property
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def vcpus(self):
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return self.instance_type['vcpus']
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def abort(self):
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"""Compute operation requiring claimed resources has failed or
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been aborted.
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"""
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LOG.debug(_("Aborting claim: %s") % self, instance=self.instance)
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self.tracker.drop_resize_claim(self.instance, self.instance_type)
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