242 lines
8.3 KiB
Python
242 lines
8.3 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 import exception
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from nova.i18n import _
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from nova.objects import base as obj_base
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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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from nova.pci import pci_request
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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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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]" % (self.memory_mb,
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self.disk_gb)
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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, resources, overhead=None,
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limits=None):
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super(Claim, self).__init__()
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# Stash a copy of the instance at the current point of time
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if isinstance(instance, obj_base.NovaObject):
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self.instance = instance.obj_clone()
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else:
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# This does not use copy.deepcopy() because it could be
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# a sqlalchemy model, and it's best to make sure we have
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# the primitive form.
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self.instance = jsonutils.to_primitive(instance)
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self.tracker = tracker
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if not overhead:
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overhead = {'memory_mb': 0}
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self.overhead = overhead
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# Check claim at constructor to avoid mess code
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# Raise exception ComputeResourcesUnavailable if claim failed
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self._claim_test(resources, limits)
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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'] + self.overhead['memory_mb']
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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 _claim_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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msg = _("Attempting claim: memory %(memory_mb)d MB, disk %(disk_gb)d "
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"GB")
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params = {'memory_mb': self.memory_mb, 'disk_gb': self.disk_gb}
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LOG.audit(msg % params, instance=self.instance)
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reasons = [self._test_memory(resources, memory_mb_limit),
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self._test_disk(resources, disk_gb_limit),
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self._test_pci()]
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reasons = reasons + self._test_ext_resources(limits)
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reasons = [r for r in reasons if r is not None]
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if len(reasons) > 0:
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raise exception.ComputeResourcesUnavailable(reason=
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"; ".join(reasons))
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LOG.audit(_('Claim successful'), instance=self.instance)
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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_pci(self):
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pci_requests = pci_request.get_instance_pci_requests(self.instance)
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if pci_requests:
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can_claim = self.tracker.pci_tracker.stats.support_requests(
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pci_requests)
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if not can_claim:
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return _('Claim pci failed.')
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def _test_ext_resources(self, limits):
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return self.tracker.ext_resources_handler.test_resources(
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self.instance, limits)
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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
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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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if requested > free:
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return (_('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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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, resources,
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overhead=None, limits=None):
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self.instance_type = instance_type
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super(ResizeClaim, self).__init__(instance, tracker, resources,
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overhead=overhead, limits=limits)
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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'] + self.overhead['memory_mb']
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def _test_pci(self):
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pci_requests = pci_request.get_instance_pci_requests(
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self.instance, 'new_')
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if pci_requests:
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claim = self.tracker.pci_tracker.stats.support_requests(
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pci_requests)
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if not claim:
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return _('Claim pci failed.')
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def _test_ext_resources(self, limits):
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return self.tracker.ext_resources_handler.test_resources(
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self.instance_type, limits)
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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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