991 lines
42 KiB
Python
991 lines
42 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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Track resources like memory and disk for a compute host. Provides the
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scheduler with useful information about availability through the ComputeNode
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model.
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"""
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import copy
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from oslo_utils import importutils
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from nova.compute import claims
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from nova.compute import monitors
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from nova.compute import task_states
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from nova.compute import vm_states
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import nova.conf
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from nova import exception
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from nova.i18n import _, _LI, _LW
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from nova import objects
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from nova.objects import base as obj_base
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from nova.objects import migration as migration_obj
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from nova.pci import manager as pci_manager
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from nova.pci import request as pci_request
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from nova import rpc
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from nova.scheduler import client as scheduler_client
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from nova import utils
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from nova.virt import hardware
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CONF = nova.conf.CONF
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LOG = logging.getLogger(__name__)
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COMPUTE_RESOURCE_SEMAPHORE = "compute_resources"
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def _instance_in_resize_state(instance):
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"""Returns True if the instance is in one of the resizing states.
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:param instance: `nova.objects.Instance` object
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"""
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vm = instance.vm_state
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task = instance.task_state
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if vm == vm_states.RESIZED:
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return True
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if (vm in [vm_states.ACTIVE, vm_states.STOPPED]
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and task in [task_states.RESIZE_PREP,
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task_states.RESIZE_MIGRATING, task_states.RESIZE_MIGRATED,
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task_states.RESIZE_FINISH, task_states.REBUILDING]):
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return True
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return False
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def _is_trackable_migration(migration):
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# Only look at resize/migrate migration and evacuation records
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# NOTE(danms): RT should probably examine live migration
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# records as well and do something smart. However, ignore
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# those for now to avoid them being included in below calculations.
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return migration.migration_type in ('resize', 'migration',
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'evacuation')
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class ResourceTracker(object):
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"""Compute helper class for keeping track of resource usage as instances
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are built and destroyed.
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"""
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def __init__(self, host, driver, nodename):
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self.host = host
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self.driver = driver
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self.pci_tracker = None
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self.nodename = nodename
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self.compute_node = None
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self.stats = importutils.import_object(CONF.compute_stats_class)
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self.tracked_instances = {}
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self.tracked_migrations = {}
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monitor_handler = monitors.MonitorHandler(self)
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self.monitors = monitor_handler.monitors
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self.old_resources = objects.ComputeNode()
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self.scheduler_client = scheduler_client.SchedulerClient()
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self.ram_allocation_ratio = CONF.ram_allocation_ratio
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self.cpu_allocation_ratio = CONF.cpu_allocation_ratio
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self.disk_allocation_ratio = CONF.disk_allocation_ratio
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def instance_claim(self, context, instance, limits=None):
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"""Indicate that some resources are needed for an upcoming compute
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instance build operation.
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This should be called before the compute node is about to perform
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an instance build operation that will consume additional resources.
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:param context: security context
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:param instance: instance to reserve resources for.
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:type instance: nova.objects.instance.Instance object
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:param limits: Dict of oversubscription limits for memory, disk,
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and CPUs.
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:returns: A Claim ticket representing the reserved resources. It can
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be used to revert the resource usage if an error occurs
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during the instance build.
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"""
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if self.disabled:
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# compute_driver doesn't support resource tracking, just
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# set the 'host' and node fields and continue the build:
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self._set_instance_host_and_node(instance)
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return claims.NopClaim()
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# sanity checks:
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if instance.host:
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LOG.warning(_LW("Host field should not be set on the instance "
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"until resources have been claimed."),
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instance=instance)
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if instance.node:
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LOG.warning(_LW("Node field should not be set on the instance "
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"until resources have been claimed."),
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instance=instance)
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# get the overhead required to build this instance:
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overhead = self.driver.estimate_instance_overhead(instance)
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LOG.debug("Memory overhead for %(flavor)d MB instance; %(overhead)d "
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"MB", {'flavor': instance.flavor.memory_mb,
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'overhead': overhead['memory_mb']})
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LOG.debug("Disk overhead for %(flavor)d GB instance; %(overhead)d "
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"GB", {'flavor': instance.flavor.root_gb,
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'overhead': overhead.get('disk_gb', 0)})
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pci_requests = objects.InstancePCIRequests.get_by_instance_uuid(
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context, instance.uuid)
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claim = claims.Claim(context, instance, self, self.compute_node,
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pci_requests, overhead=overhead, limits=limits)
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# self._set_instance_host_and_node() will save instance to the DB
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# so set instance.numa_topology first. We need to make sure
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# that numa_topology is saved while under COMPUTE_RESOURCE_SEMAPHORE
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# so that the resource audit knows about any cpus we've pinned.
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instance_numa_topology = claim.claimed_numa_topology
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instance.numa_topology = instance_numa_topology
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self._set_instance_host_and_node(instance)
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if self.pci_tracker:
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# NOTE(jaypipes): ComputeNode.pci_device_pools is set below
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# in _update_usage_from_instance().
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self.pci_tracker.claim_instance(context, pci_requests,
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instance_numa_topology)
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# Mark resources in-use and update stats
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self._update_usage_from_instance(context, instance)
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elevated = context.elevated()
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# persist changes to the compute node:
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self._update(elevated)
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return claim
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def rebuild_claim(self, context, instance, limits=None, image_meta=None,
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migration=None):
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"""Create a claim for a rebuild operation."""
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instance_type = instance.flavor
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return self._move_claim(context, instance, instance_type,
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move_type='evacuation', limits=limits,
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image_meta=image_meta, migration=migration)
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def resize_claim(self, context, instance, instance_type,
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image_meta=None, limits=None):
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"""Create a claim for a resize or cold-migration move."""
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return self._move_claim(context, instance, instance_type,
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image_meta=image_meta, limits=limits)
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def _move_claim(self, context, instance, new_instance_type, move_type=None,
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image_meta=None, limits=None, migration=None):
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"""Indicate that resources are needed for a move to this host.
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Move can be either a migrate/resize, live-migrate or an
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evacuate/rebuild operation.
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:param context: security context
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:param instance: instance object to reserve resources for
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:param new_instance_type: new instance_type being resized to
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:param image_meta: instance image metadata
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:param move_type: move type - can be one of 'migration', 'resize',
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'live-migration', 'evacuate'
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:param limits: Dict of oversubscription limits for memory, disk,
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and CPUs
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:param migration: A migration object if one was already created
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elsewhere for this operation
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:returns: A Claim ticket representing the reserved resources. This
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should be turned into finalize a resource claim or free
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resources after the compute operation is finished.
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"""
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image_meta = image_meta or {}
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if migration:
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self._claim_existing_migration(migration)
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else:
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migration = self._create_migration(context, instance,
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new_instance_type, move_type)
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if self.disabled:
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# compute_driver doesn't support resource tracking, just
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# generate the migration record and continue the resize:
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return claims.NopClaim(migration=migration)
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# get memory overhead required to build this instance:
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overhead = self.driver.estimate_instance_overhead(new_instance_type)
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LOG.debug("Memory overhead for %(flavor)d MB instance; %(overhead)d "
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"MB", {'flavor': new_instance_type.memory_mb,
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'overhead': overhead['memory_mb']})
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LOG.debug("Disk overhead for %(flavor)d GB instance; %(overhead)d "
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"GB", {'flavor': instance.flavor.root_gb,
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'overhead': overhead.get('disk_gb', 0)})
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# TODO(moshele): we are recreating the pci requests even if
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# there was no change on resize. This will cause allocating
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# the old/new pci device in the resize phase. In the future
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# we would like to optimise this.
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new_pci_requests = pci_request.get_pci_requests_from_flavor(
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new_instance_type)
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new_pci_requests.instance_uuid = instance.uuid
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# PCI requests come from two sources: instance flavor and
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# SR-IOV ports. SR-IOV ports pci_request don't have an alias_name.
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# On resize merge the SR-IOV ports pci_requests with the new
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# instance flavor pci_requests.
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if instance.pci_requests:
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for request in instance.pci_requests.requests:
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if request.alias_name is None:
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new_pci_requests.requests.append(request)
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claim = claims.MoveClaim(context, instance, new_instance_type,
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image_meta, self, self.compute_node,
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new_pci_requests, overhead=overhead,
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limits=limits)
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claim.migration = migration
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claimed_pci_devices_objs = []
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if self.pci_tracker:
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# NOTE(jaypipes): ComputeNode.pci_device_pools is set below
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# in _update_usage_from_instance().
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claimed_pci_devices_objs = self.pci_tracker.claim_instance(
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context, new_pci_requests, claim.claimed_numa_topology)
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claimed_pci_devices = objects.PciDeviceList(
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objects=claimed_pci_devices_objs)
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# TODO(jaypipes): Move claimed_numa_topology out of the Claim's
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# constructor flow so the Claim constructor only tests whether
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# resources can be claimed, not consume the resources directly.
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mig_context = objects.MigrationContext(
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context=context, instance_uuid=instance.uuid,
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migration_id=migration.id,
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old_numa_topology=instance.numa_topology,
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new_numa_topology=claim.claimed_numa_topology,
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old_pci_devices=instance.pci_devices,
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new_pci_devices=claimed_pci_devices,
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old_pci_requests=instance.pci_requests,
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new_pci_requests=new_pci_requests)
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instance.migration_context = mig_context
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instance.save()
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# Mark the resources in-use for the resize landing on this
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# compute host:
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self._update_usage_from_migration(context, instance, migration)
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elevated = context.elevated()
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self._update(elevated)
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return claim
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def _create_migration(self, context, instance, new_instance_type,
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move_type=None):
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"""Create a migration record for the upcoming resize. This should
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be done while the COMPUTE_RESOURCES_SEMAPHORE is held so the resource
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claim will not be lost if the audit process starts.
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"""
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migration = objects.Migration(context=context.elevated())
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migration.dest_compute = self.host
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migration.dest_node = self.nodename
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migration.dest_host = self.driver.get_host_ip_addr()
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migration.old_instance_type_id = instance.flavor.id
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migration.new_instance_type_id = new_instance_type.id
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migration.status = 'pre-migrating'
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migration.instance_uuid = instance.uuid
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migration.source_compute = instance.host
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migration.source_node = instance.node
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if move_type:
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migration.migration_type = move_type
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else:
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migration.migration_type = migration_obj.determine_migration_type(
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migration)
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migration.create()
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return migration
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def _claim_existing_migration(self, migration):
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"""Make an existing migration record count for resource tracking.
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If a migration record was created already before the request made
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it to this compute host, only set up the migration so it's included in
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resource tracking. This should be done while the
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COMPUTE_RESOURCES_SEMAPHORE is held.
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"""
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migration.dest_compute = self.host
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migration.dest_node = self.nodename
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migration.dest_host = self.driver.get_host_ip_addr()
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migration.status = 'pre-migrating'
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migration.save()
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def _set_instance_host_and_node(self, instance):
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"""Tag the instance as belonging to this host. This should be done
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while the COMPUTE_RESOURCES_SEMAPHORE is held so the resource claim
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will not be lost if the audit process starts.
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"""
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instance.host = self.host
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instance.launched_on = self.host
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instance.node = self.nodename
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instance.save()
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def _unset_instance_host_and_node(self, instance):
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"""Untag the instance so it no longer belongs to the host.
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This should be done while the COMPUTE_RESOURCES_SEMAPHORE is held so
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the resource claim will not be lost if the audit process starts.
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"""
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instance.host = None
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instance.node = None
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instance.save()
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def abort_instance_claim(self, context, instance):
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"""Remove usage from the given instance."""
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self._update_usage_from_instance(context, instance, is_removed=True)
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instance.clear_numa_topology()
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self._unset_instance_host_and_node(instance)
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self._update(context.elevated())
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def drop_move_claim(self, context, instance, instance_type=None,
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prefix='new_'):
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"""Remove usage for an incoming/outgoing migration."""
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if instance['uuid'] in self.tracked_migrations:
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migration, itype = self.tracked_migrations.pop(instance['uuid'])
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if not instance_type:
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ctxt = context.elevated()
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instance_type = self._get_instance_type(ctxt, instance, prefix,
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migration)
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if instance_type is not None and instance_type.id == itype['id']:
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numa_topology = self._get_migration_context_resource(
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'numa_topology', instance, prefix=prefix)
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usage = self._get_usage_dict(
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itype, numa_topology=numa_topology)
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if self.pci_tracker:
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# free old/new allocated pci devices
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pci_devices = self._get_migration_context_resource(
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'pci_devices', instance, prefix=prefix)
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if pci_devices:
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for pci_device in pci_devices:
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self.pci_tracker.free_device(pci_device, instance)
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self._update_usage(usage, sign=-1)
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ctxt = context.elevated()
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self._update(ctxt)
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@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
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def update_usage(self, context, instance):
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"""Update the resource usage and stats after a change in an
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instance
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"""
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if self.disabled:
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return
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uuid = instance['uuid']
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# don't update usage for this instance unless it submitted a resource
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# claim first:
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if uuid in self.tracked_instances:
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self._update_usage_from_instance(context, instance)
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self._update(context.elevated())
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@property
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def disabled(self):
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return self.compute_node is None
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def _init_compute_node(self, context, resources):
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"""Initialize the compute node if it does not already exist.
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The resource tracker will be inoperable if compute_node
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is not defined. The compute_node will remain undefined if
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we fail to create it or if there is no associated service
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registered.
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If this method has to create a compute node it needs initial
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values - these come from resources.
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:param context: security context
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:param resources: initial values
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"""
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# if there is already a compute node just use resources
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# to initialize
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if self.compute_node:
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self._copy_resources(resources)
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self._setup_pci_tracker(context, resources)
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self.scheduler_client.update_resource_stats(self.compute_node)
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return
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# now try to get the compute node record from the
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# database. If we get one we use resources to initialize
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self.compute_node = self._get_compute_node(context)
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if self.compute_node:
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self._copy_resources(resources)
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self._setup_pci_tracker(context, resources)
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self.scheduler_client.update_resource_stats(self.compute_node)
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return
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# there was no local copy and none in the database
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# so we need to create a new compute node. This needs
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# to be initialized with resource values.
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self.compute_node = objects.ComputeNode(context)
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self.compute_node.host = self.host
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self._copy_resources(resources)
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self.compute_node.create()
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LOG.info(_LI('Compute_service record created for '
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'%(host)s:%(node)s'),
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{'host': self.host, 'node': self.nodename})
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self._setup_pci_tracker(context, resources)
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self.scheduler_client.update_resource_stats(self.compute_node)
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def _setup_pci_tracker(self, context, resources):
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if not self.pci_tracker:
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n_id = self.compute_node.id if self.compute_node else None
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self.pci_tracker = pci_manager.PciDevTracker(context, node_id=n_id)
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if 'pci_passthrough_devices' in resources:
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dev_json = resources.pop('pci_passthrough_devices')
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self.pci_tracker.update_devices_from_hypervisor_resources(
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dev_json)
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dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
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self.compute_node.pci_device_pools = dev_pools_obj
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def _copy_resources(self, resources):
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"""Copy resource values to initialize compute_node and related
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data structures.
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"""
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# purge old stats and init with anything passed in by the driver
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self.stats.clear()
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self.stats.digest_stats(resources.get('stats'))
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self.compute_node.stats = copy.deepcopy(self.stats)
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# update the allocation ratios for the related ComputeNode object
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self.compute_node.ram_allocation_ratio = self.ram_allocation_ratio
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self.compute_node.cpu_allocation_ratio = self.cpu_allocation_ratio
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self.compute_node.disk_allocation_ratio = self.disk_allocation_ratio
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# now copy rest to compute_node
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self.compute_node.update_from_virt_driver(resources)
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|
|
def _get_host_metrics(self, context, nodename):
|
|
"""Get the metrics from monitors and
|
|
notify information to message bus.
|
|
"""
|
|
metrics = objects.MonitorMetricList()
|
|
metrics_info = {}
|
|
for monitor in self.monitors:
|
|
try:
|
|
monitor.populate_metrics(metrics)
|
|
except Exception as exc:
|
|
LOG.warning(_LW("Cannot get the metrics from %(mon)s; "
|
|
"error: %(exc)s"),
|
|
{'mon': monitor, 'exc': exc})
|
|
# TODO(jaypipes): Remove this when compute_node.metrics doesn't need
|
|
# to be populated as a JSONified string.
|
|
metrics = metrics.to_list()
|
|
if len(metrics):
|
|
metrics_info['nodename'] = nodename
|
|
metrics_info['metrics'] = metrics
|
|
metrics_info['host'] = self.host
|
|
metrics_info['host_ip'] = CONF.my_ip
|
|
notifier = rpc.get_notifier(service='compute', host=nodename)
|
|
notifier.info(context, 'compute.metrics.update', metrics_info)
|
|
return metrics
|
|
|
|
def update_available_resource(self, context):
|
|
"""Override in-memory calculations of compute node resource usage based
|
|
on data audited from the hypervisor layer.
|
|
|
|
Add in resource claims in progress to account for operations that have
|
|
declared a need for resources, but not necessarily retrieved them from
|
|
the hypervisor layer yet.
|
|
"""
|
|
LOG.info(_LI("Auditing locally available compute resources for "
|
|
"node %(node)s"),
|
|
{'node': self.nodename})
|
|
resources = self.driver.get_available_resource(self.nodename)
|
|
resources['host_ip'] = CONF.my_ip
|
|
|
|
# We want the 'cpu_info' to be None from the POV of the
|
|
# virt driver, but the DB requires it to be non-null so
|
|
# just force it to empty string
|
|
if "cpu_info" not in resources or resources["cpu_info"] is None:
|
|
resources["cpu_info"] = ''
|
|
|
|
self._verify_resources(resources)
|
|
|
|
self._report_hypervisor_resource_view(resources)
|
|
|
|
self._update_available_resource(context, resources)
|
|
|
|
def _pair_instances_to_migrations(self, migrations, instances):
|
|
instance_by_uuid = {inst.uuid: inst for inst in instances}
|
|
for migration in migrations:
|
|
try:
|
|
migration.instance = instance_by_uuid[migration.instance_uuid]
|
|
except KeyError:
|
|
# NOTE(danms): If this happens, we don't set it here, and
|
|
# let the code either fail or lazy-load the instance later
|
|
# which is what happened before we added this optimization.
|
|
# NOTE(tdurakov) this situation is possible for resize/cold
|
|
# migration when migration is finished but haven't yet
|
|
# confirmed/reverted in that case instance already changed host
|
|
# to destination and no matching happens
|
|
LOG.debug('Migration for instance %(uuid)s refers to '
|
|
'another host\'s instance!',
|
|
{'uuid': migration.instance_uuid})
|
|
|
|
@utils.synchronized(COMPUTE_RESOURCE_SEMAPHORE)
|
|
def _update_available_resource(self, context, resources):
|
|
|
|
# initialize the compute node object, creating it
|
|
# if it does not already exist.
|
|
self._init_compute_node(context, resources)
|
|
|
|
# if we could not init the compute node the tracker will be
|
|
# disabled and we should quit now
|
|
if self.disabled:
|
|
return
|
|
|
|
# Grab all instances assigned to this node:
|
|
instances = objects.InstanceList.get_by_host_and_node(
|
|
context, self.host, self.nodename,
|
|
expected_attrs=['system_metadata',
|
|
'numa_topology',
|
|
'flavor', 'migration_context'])
|
|
|
|
# Now calculate usage based on instance utilization:
|
|
self._update_usage_from_instances(context, instances)
|
|
|
|
# Grab all in-progress migrations:
|
|
migrations = objects.MigrationList.get_in_progress_by_host_and_node(
|
|
context, self.host, self.nodename)
|
|
|
|
self._pair_instances_to_migrations(migrations, instances)
|
|
self._update_usage_from_migrations(context, migrations)
|
|
|
|
# Detect and account for orphaned instances that may exist on the
|
|
# hypervisor, but are not in the DB:
|
|
orphans = self._find_orphaned_instances()
|
|
self._update_usage_from_orphans(orphans)
|
|
|
|
# NOTE(yjiang5): Because pci device tracker status is not cleared in
|
|
# this periodic task, and also because the resource tracker is not
|
|
# notified when instances are deleted, we need remove all usages
|
|
# from deleted instances.
|
|
self.pci_tracker.clean_usage(instances, migrations, orphans)
|
|
dev_pools_obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
self.compute_node.pci_device_pools = dev_pools_obj
|
|
|
|
self._report_final_resource_view()
|
|
|
|
metrics = self._get_host_metrics(context, self.nodename)
|
|
# TODO(pmurray): metrics should not be a json string in ComputeNode,
|
|
# but it is. This should be changed in ComputeNode
|
|
self.compute_node.metrics = jsonutils.dumps(metrics)
|
|
|
|
# update the compute_node
|
|
self._update(context)
|
|
LOG.info(_LI('Compute_service record updated for %(host)s:%(node)s'),
|
|
{'host': self.host, 'node': self.nodename})
|
|
|
|
def _get_compute_node(self, context):
|
|
"""Returns compute node for the host and nodename."""
|
|
try:
|
|
return objects.ComputeNode.get_by_host_and_nodename(
|
|
context, self.host, self.nodename)
|
|
except exception.NotFound:
|
|
LOG.warning(_LW("No compute node record for %(host)s:%(node)s"),
|
|
{'host': self.host, 'node': self.nodename})
|
|
|
|
def _report_hypervisor_resource_view(self, resources):
|
|
"""Log the hypervisor's view of free resources.
|
|
|
|
This is just a snapshot of resource usage recorded by the
|
|
virt driver.
|
|
|
|
The following resources are logged:
|
|
- free memory
|
|
- free disk
|
|
- free CPUs
|
|
- assignable PCI devices
|
|
"""
|
|
free_ram_mb = resources['memory_mb'] - resources['memory_mb_used']
|
|
free_disk_gb = resources['local_gb'] - resources['local_gb_used']
|
|
vcpus = resources['vcpus']
|
|
if vcpus:
|
|
free_vcpus = vcpus - resources['vcpus_used']
|
|
LOG.debug("Hypervisor: free VCPUs: %s", free_vcpus)
|
|
else:
|
|
free_vcpus = 'unknown'
|
|
LOG.debug("Hypervisor: VCPU information unavailable")
|
|
|
|
pci_devices = resources.get('pci_passthrough_devices')
|
|
|
|
LOG.debug("Hypervisor/Node resource view: "
|
|
"name=%(node)s "
|
|
"free_ram=%(free_ram)sMB "
|
|
"free_disk=%(free_disk)sGB "
|
|
"free_vcpus=%(free_vcpus)s "
|
|
"pci_devices=%(pci_devices)s",
|
|
{'node': self.nodename,
|
|
'free_ram': free_ram_mb,
|
|
'free_disk': free_disk_gb,
|
|
'free_vcpus': free_vcpus,
|
|
'pci_devices': pci_devices})
|
|
|
|
def _report_final_resource_view(self):
|
|
"""Report final calculate of physical memory, used virtual memory,
|
|
disk, usable vCPUs, used virtual CPUs and PCI devices,
|
|
including instance calculations and in-progress resource claims. These
|
|
values will be exposed via the compute node table to the scheduler.
|
|
"""
|
|
vcpus = self.compute_node.vcpus
|
|
if vcpus:
|
|
tcpu = vcpus
|
|
ucpu = self.compute_node.vcpus_used
|
|
LOG.info(_LI("Total usable vcpus: %(tcpu)s, "
|
|
"total allocated vcpus: %(ucpu)s"),
|
|
{'tcpu': vcpus,
|
|
'ucpu': ucpu})
|
|
else:
|
|
tcpu = 0
|
|
ucpu = 0
|
|
pci_stats = (list(self.compute_node.pci_device_pools) if
|
|
self.compute_node.pci_device_pools else [])
|
|
LOG.info(_LI("Final resource view: "
|
|
"name=%(node)s "
|
|
"phys_ram=%(phys_ram)sMB "
|
|
"used_ram=%(used_ram)sMB "
|
|
"phys_disk=%(phys_disk)sGB "
|
|
"used_disk=%(used_disk)sGB "
|
|
"total_vcpus=%(total_vcpus)s "
|
|
"used_vcpus=%(used_vcpus)s "
|
|
"pci_stats=%(pci_stats)s"),
|
|
{'node': self.nodename,
|
|
'phys_ram': self.compute_node.memory_mb,
|
|
'used_ram': self.compute_node.memory_mb_used,
|
|
'phys_disk': self.compute_node.local_gb,
|
|
'used_disk': self.compute_node.local_gb_used,
|
|
'total_vcpus': tcpu,
|
|
'used_vcpus': ucpu,
|
|
'pci_stats': pci_stats})
|
|
|
|
def _resource_change(self):
|
|
"""Check to see if any resources have changed."""
|
|
if not obj_base.obj_equal_prims(self.compute_node, self.old_resources):
|
|
self.old_resources = copy.deepcopy(self.compute_node)
|
|
return True
|
|
return False
|
|
|
|
def _update(self, context):
|
|
"""Update partial stats locally and populate them to Scheduler."""
|
|
if not self._resource_change():
|
|
return
|
|
# Persist the stats to the Scheduler
|
|
self.scheduler_client.update_resource_stats(self.compute_node)
|
|
if self.pci_tracker:
|
|
self.pci_tracker.save(context)
|
|
|
|
def _update_usage(self, usage, sign=1):
|
|
mem_usage = usage['memory_mb']
|
|
disk_usage = usage.get('root_gb', 0)
|
|
|
|
overhead = self.driver.estimate_instance_overhead(usage)
|
|
mem_usage += overhead['memory_mb']
|
|
disk_usage += overhead.get('disk_gb', 0)
|
|
|
|
self.compute_node.memory_mb_used += sign * mem_usage
|
|
self.compute_node.local_gb_used += sign * disk_usage
|
|
self.compute_node.local_gb_used += sign * usage.get('ephemeral_gb', 0)
|
|
self.compute_node.vcpus_used += sign * usage.get('vcpus', 0)
|
|
|
|
# free ram and disk may be negative, depending on policy:
|
|
self.compute_node.free_ram_mb = (self.compute_node.memory_mb -
|
|
self.compute_node.memory_mb_used)
|
|
self.compute_node.free_disk_gb = (self.compute_node.local_gb -
|
|
self.compute_node.local_gb_used)
|
|
|
|
self.compute_node.running_vms = self.stats.num_instances
|
|
|
|
# Calculate the numa usage
|
|
free = sign == -1
|
|
updated_numa_topology = hardware.get_host_numa_usage_from_instance(
|
|
self.compute_node, usage, free)
|
|
self.compute_node.numa_topology = updated_numa_topology
|
|
|
|
def _get_migration_context_resource(self, resource, instance,
|
|
prefix='new_'):
|
|
migration_context = instance.migration_context
|
|
resource = prefix + resource
|
|
if migration_context and resource in migration_context:
|
|
return getattr(migration_context, resource)
|
|
return None
|
|
|
|
def _update_usage_from_migration(self, context, instance, migration):
|
|
"""Update usage for a single migration. The record may
|
|
represent an incoming or outbound migration.
|
|
"""
|
|
if not _is_trackable_migration(migration):
|
|
return
|
|
|
|
uuid = migration.instance_uuid
|
|
LOG.info(_LI("Updating from migration %s"), uuid)
|
|
|
|
incoming = (migration.dest_compute == self.host and
|
|
migration.dest_node == self.nodename)
|
|
outbound = (migration.source_compute == self.host and
|
|
migration.source_node == self.nodename)
|
|
same_node = (incoming and outbound)
|
|
|
|
record = self.tracked_instances.get(uuid, None)
|
|
itype = None
|
|
numa_topology = None
|
|
sign = 0
|
|
if same_node:
|
|
# same node resize. record usage for whichever instance type the
|
|
# instance is *not* in:
|
|
if (instance['instance_type_id'] ==
|
|
migration.old_instance_type_id):
|
|
itype = self._get_instance_type(context, instance, 'new_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance)
|
|
# Allocate pci device(s) for the instance.
|
|
sign = 1
|
|
else:
|
|
# instance record already has new flavor, hold space for a
|
|
# possible revert to the old instance type:
|
|
itype = self._get_instance_type(context, instance, 'old_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
|
|
elif incoming and not record:
|
|
# instance has not yet migrated here:
|
|
itype = self._get_instance_type(context, instance, 'new_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance)
|
|
# Allocate pci device(s) for the instance.
|
|
sign = 1
|
|
|
|
elif outbound and not record:
|
|
# instance migrated, but record usage for a possible revert:
|
|
itype = self._get_instance_type(context, instance, 'old_',
|
|
migration)
|
|
numa_topology = self._get_migration_context_resource(
|
|
'numa_topology', instance, prefix='old_')
|
|
|
|
if itype:
|
|
usage = self._get_usage_dict(
|
|
itype, numa_topology=numa_topology)
|
|
if self.pci_tracker and sign:
|
|
self.pci_tracker.update_pci_for_instance(
|
|
context, instance, sign=sign)
|
|
self._update_usage(usage)
|
|
if self.pci_tracker:
|
|
obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
self.compute_node.pci_device_pools = obj
|
|
else:
|
|
obj = objects.PciDevicePoolList()
|
|
self.compute_node.pci_device_pools = obj
|
|
self.tracked_migrations[uuid] = (migration, itype)
|
|
|
|
def _update_usage_from_migrations(self, context, migrations):
|
|
filtered = {}
|
|
instances = {}
|
|
self.tracked_migrations.clear()
|
|
|
|
# do some defensive filtering against bad migrations records in the
|
|
# database:
|
|
for migration in migrations:
|
|
uuid = migration.instance_uuid
|
|
|
|
try:
|
|
if uuid not in instances:
|
|
instances[uuid] = migration.instance
|
|
except exception.InstanceNotFound as e:
|
|
# migration referencing deleted instance
|
|
LOG.debug('Migration instance not found: %s', e)
|
|
continue
|
|
|
|
# skip migration if instance isn't in a resize state:
|
|
if not _instance_in_resize_state(instances[uuid]):
|
|
LOG.warning(_LW("Instance not resizing, skipping migration."),
|
|
instance_uuid=uuid)
|
|
continue
|
|
|
|
# filter to most recently updated migration for each instance:
|
|
other_migration = filtered.get(uuid, None)
|
|
# NOTE(claudiub): In Python 3, you cannot compare NoneTypes.
|
|
if (not other_migration or (
|
|
migration.updated_at and other_migration.updated_at and
|
|
migration.updated_at >= other_migration.updated_at)):
|
|
filtered[uuid] = migration
|
|
|
|
for migration in filtered.values():
|
|
instance = instances[migration.instance_uuid]
|
|
try:
|
|
self._update_usage_from_migration(context, instance, migration)
|
|
except exception.FlavorNotFound:
|
|
LOG.warning(_LW("Flavor could not be found, skipping "
|
|
"migration."), instance_uuid=instance.uuid)
|
|
continue
|
|
|
|
def _update_usage_from_instance(self, context, instance, is_removed=False):
|
|
"""Update usage for a single instance."""
|
|
|
|
uuid = instance['uuid']
|
|
is_new_instance = uuid not in self.tracked_instances
|
|
# NOTE(sfinucan): Both brand new instances as well as instances that
|
|
# are being unshelved will have is_new_instance == True
|
|
is_removed_instance = not is_new_instance and (is_removed or
|
|
instance['vm_state'] in vm_states.ALLOW_RESOURCE_REMOVAL)
|
|
|
|
if is_new_instance:
|
|
self.tracked_instances[uuid] = obj_base.obj_to_primitive(instance)
|
|
sign = 1
|
|
|
|
if is_removed_instance:
|
|
self.tracked_instances.pop(uuid)
|
|
sign = -1
|
|
|
|
self.stats.update_stats_for_instance(instance, is_removed_instance)
|
|
self.compute_node.stats = copy.deepcopy(self.stats)
|
|
|
|
# if it's a new or deleted instance:
|
|
if is_new_instance or is_removed_instance:
|
|
if self.pci_tracker:
|
|
self.pci_tracker.update_pci_for_instance(context,
|
|
instance,
|
|
sign=sign)
|
|
self.scheduler_client.reportclient.update_instance_allocation(
|
|
self.compute_node, instance, sign)
|
|
# new instance, update compute node resource usage:
|
|
self._update_usage(self._get_usage_dict(instance), sign=sign)
|
|
|
|
self.compute_node.current_workload = self.stats.calculate_workload()
|
|
if self.pci_tracker:
|
|
obj = self.pci_tracker.stats.to_device_pools_obj()
|
|
self.compute_node.pci_device_pools = obj
|
|
else:
|
|
self.compute_node.pci_device_pools = objects.PciDevicePoolList()
|
|
|
|
def _update_usage_from_instances(self, context, instances):
|
|
"""Calculate resource usage based on instance utilization. This is
|
|
different than the hypervisor's view as it will account for all
|
|
instances assigned to the local compute host, even if they are not
|
|
currently powered on.
|
|
"""
|
|
self.tracked_instances.clear()
|
|
|
|
# set some initial values, reserve room for host/hypervisor:
|
|
self.compute_node.local_gb_used = CONF.reserved_host_disk_mb / 1024
|
|
self.compute_node.memory_mb_used = CONF.reserved_host_memory_mb
|
|
self.compute_node.vcpus_used = 0
|
|
self.compute_node.free_ram_mb = (self.compute_node.memory_mb -
|
|
self.compute_node.memory_mb_used)
|
|
self.compute_node.free_disk_gb = (self.compute_node.local_gb -
|
|
self.compute_node.local_gb_used)
|
|
self.compute_node.current_workload = 0
|
|
self.compute_node.running_vms = 0
|
|
|
|
for instance in instances:
|
|
if instance.vm_state not in vm_states.ALLOW_RESOURCE_REMOVAL:
|
|
self._update_usage_from_instance(context, instance)
|
|
|
|
self.scheduler_client.reportclient.remove_deleted_instances(
|
|
self.compute_node, self.tracked_instances.values())
|
|
|
|
def _find_orphaned_instances(self):
|
|
"""Given the set of instances and migrations already account for
|
|
by resource tracker, sanity check the hypervisor to determine
|
|
if there are any "orphaned" instances left hanging around.
|
|
|
|
Orphans could be consuming memory and should be accounted for in
|
|
usage calculations to guard against potential out of memory
|
|
errors.
|
|
"""
|
|
uuids1 = frozenset(self.tracked_instances.keys())
|
|
uuids2 = frozenset(self.tracked_migrations.keys())
|
|
uuids = uuids1 | uuids2
|
|
|
|
usage = self.driver.get_per_instance_usage()
|
|
vuuids = frozenset(usage.keys())
|
|
|
|
orphan_uuids = vuuids - uuids
|
|
orphans = [usage[uuid] for uuid in orphan_uuids]
|
|
|
|
return orphans
|
|
|
|
def _update_usage_from_orphans(self, orphans):
|
|
"""Include orphaned instances in usage."""
|
|
for orphan in orphans:
|
|
memory_mb = orphan['memory_mb']
|
|
|
|
LOG.warning(_LW("Detected running orphan instance: %(uuid)s "
|
|
"(consuming %(memory_mb)s MB memory)"),
|
|
{'uuid': orphan['uuid'], 'memory_mb': memory_mb})
|
|
|
|
# just record memory usage for the orphan
|
|
usage = {'memory_mb': memory_mb}
|
|
self._update_usage(usage)
|
|
|
|
def _verify_resources(self, resources):
|
|
resource_keys = ["vcpus", "memory_mb", "local_gb", "cpu_info",
|
|
"vcpus_used", "memory_mb_used", "local_gb_used",
|
|
"numa_topology"]
|
|
|
|
missing_keys = [k for k in resource_keys if k not in resources]
|
|
if missing_keys:
|
|
reason = _("Missing keys: %s") % missing_keys
|
|
raise exception.InvalidInput(reason=reason)
|
|
|
|
def _get_instance_type(self, context, instance, prefix, migration):
|
|
"""Get the instance type from instance."""
|
|
stashed_flavors = migration.migration_type in ('resize',)
|
|
if stashed_flavors:
|
|
return getattr(instance, '%sflavor' % prefix)
|
|
else:
|
|
# NOTE(ndipanov): Certain migration types (all but resize)
|
|
# do not change flavors so there is no need to stash
|
|
# them. In that case - just get the instance flavor.
|
|
return instance.flavor
|
|
|
|
def _get_usage_dict(self, object_or_dict, **updates):
|
|
"""Make a usage dict _update methods expect.
|
|
|
|
Accepts a dict or an Instance or Flavor object, and a set of updates.
|
|
Converts the object to a dict and applies the updates.
|
|
|
|
:param object_or_dict: instance or flavor as an object or just a dict
|
|
:param updates: key-value pairs to update the passed object.
|
|
Currently only considers 'numa_topology', all other
|
|
keys are ignored.
|
|
|
|
:returns: a dict with all the information from object_or_dict updated
|
|
with updates
|
|
"""
|
|
usage = {}
|
|
if isinstance(object_or_dict, objects.Instance):
|
|
usage = {'memory_mb': object_or_dict.flavor.memory_mb,
|
|
'vcpus': object_or_dict.flavor.vcpus,
|
|
'root_gb': object_or_dict.flavor.root_gb,
|
|
'ephemeral_gb': object_or_dict.flavor.ephemeral_gb,
|
|
'numa_topology': object_or_dict.numa_topology}
|
|
elif isinstance(object_or_dict, objects.Flavor):
|
|
usage = obj_base.obj_to_primitive(object_or_dict)
|
|
else:
|
|
usage.update(object_or_dict)
|
|
|
|
for key in ('numa_topology',):
|
|
if key in updates:
|
|
usage[key] = updates[key]
|
|
return usage
|