281 lines
9.6 KiB
Python
281 lines
9.6 KiB
Python
# Copyright (c) 2017 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 oslo_log import log as logging
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import random
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from zun.common import exception
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from zun.common.i18n import _
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from zun import objects
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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, *args, **kwargs):
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self.claimed_numa_topology = None
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@property
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def memory(self):
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return 0
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@property
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def cpu(self):
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return 0
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@property
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def disk(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: %s memory, %.2f VCPU]" % (self.memory,
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self.cpu)
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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, context, container, tracker, resources, pci_requests,
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limits=None):
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super(Claim, self).__init__()
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# Stash a copy of the container at the current point of time
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self.container = container.obj_clone()
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self._numa_topology_loaded = False
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self.tracker = tracker
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self.context = context
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self._pci_requests = pci_requests
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# Check claim at constructor to avoid mess code
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# Raise exception ResourcesUnavailable if claim failed
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self._claim_test(resources, limits)
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if container.cpu_policy == 'dedicated':
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container.cpuset = objects.container.Cpuset()
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self.claim_cpuset_cpu_for_container(container, limits)
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self.claim_cpuset_mem_for_container(container, limits)
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@property
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def memory(self):
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return int(self.container.memory or "0")
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@property
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def cpu(self):
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return self.container.cpu or 0
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@property
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def disk(self):
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return self.container.disk or 0
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def abort(self):
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"""Requiring claimed resources has failed or been aborted."""
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LOG.debug("Aborting claim: %s", self)
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self.tracker.abort_container_claim(self.context, self.container)
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def claim_cpuset_cpu_for_container(self, container, limits):
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available_cpu = list(set(limits['cpuset']['cpuset_cpu']) -
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set(limits['cpuset']['cpuset_cpu_pinned']))
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cpuset_cpu_usage = random.sample(available_cpu, int(self.cpu))
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container.cpuset.cpuset_cpus = set(cpuset_cpu_usage)
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def claim_cpuset_mem_for_container(self, container, limits):
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container.cpuset.cpuset_mems = set(limits['cpuset']['node'])
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def _claim_test(self, resources, limits=None):
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"""Test if this claim can be satisfied.
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With given available resources and 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_limit = limits.get('memory')
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cpu_limit = limits.get('cpu')
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disk_limit = limits.get('disk')
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cpuset_limit = limits.get('cpuset', None)
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LOG.info('Attempting claim: memory %(memory)s, '
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'cpu %(cpu).02f CPU, disk %(disk)s',
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{'memory': self.memory, 'cpu': self.cpu, 'disk': self.disk})
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reasons = [self._test_memory(resources, memory_limit),
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self._test_cpu(resources, cpu_limit),
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self._test_disk(resources, disk_limit),
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self._test_pci(),
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self._test_cpuset_cpu(resources, cpuset_limit),
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self._test_cpuset_mem(resources, cpuset_limit)]
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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.ResourcesUnavailable(reason="; ".join(reasons))
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LOG.info('Claim successful')
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def _test_pci(self):
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pci_requests = self._pci_requests
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if pci_requests and pci_requests.requests:
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stats = self.tracker.pci_tracker.stats
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if not stats.support_requests(pci_requests.requests):
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return _('Claim pci failed')
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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.mem_total
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used = resources.mem_used
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requested = self.memory
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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_ = _("vcpu")
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unit = "VCPU"
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total = resources.cpus
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used = resources.cpu_used
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requested = self.cpu
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return self._test(type_, unit, total, used, requested, limit)
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def _test_cpuset_cpu(self, resources, limit):
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if limit:
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type_ = _("cpuset_cpu")
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unit = "core"
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total = len(limit['cpuset_cpu'])
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used = len(limit['cpuset_cpu_pinned'])
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requested = self.cpu
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return self._test(type_, unit, total, used, requested,
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len(limit['cpuset_cpu']))
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else:
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return
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def _test_cpuset_mem(self, resources, limit):
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if limit:
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type_ = _("cpuset_mem")
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unit = "M"
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total = resources.numa_topology.nodes[limit['node']].mem_total
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used = 0
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requested = self.memory
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return self._test(type_, unit, total, used, requested,
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limit['cpuset_mem'])
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else:
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return
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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.disk_total
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used = resources.disk_used
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requested = self.disk
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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 type resource needed for a claim can be allocated."""
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LOG.info('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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if limit is None:
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# treat resource as unlimited:
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LOG.info('%(type)s limit not specified, defaulting to '
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'unlimited', {'type': type_})
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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.info('%(type)s limit: %(limit).02f %(unit)s, '
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'free: %(free).02f %(unit)s',
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{'type': type_, 'limit': limit, 'free': free, 'unit': unit})
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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)s %(unit)s') %
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{'type': type_, 'free': free, 'unit': unit,
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'requested': requested})
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class UpdateClaim(Claim):
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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, context, new_container, old_container, tracker,
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resources, limits=None):
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# Stash a copy of the container at the current point of time
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self.new_container = new_container.obj_clone()
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self.old_container = old_container.obj_clone()
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super(UpdateClaim, self).__init__(
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context, new_container, tracker, resources,
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objects.ContainerPCIRequests(requests=[]), limits)
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@property
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def memory(self):
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new_mem_str = self.new_container.memory or "0"
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old_mem_str = self.old_container.memory or "0"
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return int(new_mem_str) - int(old_mem_str)
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@property
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def cpu(self):
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new_cpu = self.new_container.cpu or 0
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old_cpu = self.old_container.cpu or 0
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return new_cpu - old_cpu
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def abort(self):
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"""Requiring claimed resources has failed or been aborted."""
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LOG.debug("Aborting claim: %s", self)
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self.tracker.abort_container_update_claim(
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self.context, self.new_container, self.old_container)
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