Exemple #1
0
def build_request_spec(ctxt, image, instances, instance_type=None):
    """Build a request_spec for the scheduler.

    The request_spec assumes that all instances to be scheduled are the same
    type.
    """
    instance = instances[0]
    if instance_type is None:
        if isinstance(instance, objects.Instance):
            instance_type = instance.get_flavor()
        else:
            instance_type = flavors.extract_flavor(instance)

    if isinstance(instance, objects.Instance):
        instance = instance_obj.compat_instance(instance)

    if isinstance(instance_type, objects.Flavor):
        instance_type = obj_base.obj_to_primitive(instance_type)

    request_spec = {
            'image': image or {},
            'instance_properties': instance,
            'instance_type': instance_type,
            'num_instances': len(instances)}
    return jsonutils.to_primitive(request_spec)
    def _update_usage_from_instance(self, context, resources, instance):
        """Update usage for a single instance."""

        uuid = instance['uuid']
        is_new_instance = uuid not in self.tracked_instances
        is_deleted_instance = instance['vm_state'] == vm_states.DELETED

        if is_new_instance:
            self.tracked_instances[uuid] = instance_obj.compat_instance(
                instance)
            sign = 1

        if is_deleted_instance:
            self.tracked_instances.pop(uuid)
            sign = -1

        self.stats.update_stats_for_instance(instance)

        if self.pci_tracker:
            self.pci_tracker.update_pci_for_instance(context, instance)

        # if it's a new or deleted instance:
        if is_new_instance or is_deleted_instance:
            # new instance, update compute node resource usage:
            self._update_usage(context, resources, instance, sign=sign)

        resources['current_workload'] = self.stats.calculate_workload()
        if self.pci_tracker:
            resources['pci_device_pools'] = self.pci_tracker.stats
        else:
            resources['pci_device_pools'] = []
    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 = instance_obj.compat_instance(object_or_dict)
        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
    def resize_claim(self, context, instance, instance_type,
                     image_meta=None, limits=None):
        """Indicate that resources are needed for a resize operation to this
        compute host.
        :param context: security context
        :param instance: instance object to reserve resources for
        :param instance_type: new instance_type being resized to
        :param limits: Dict of oversubscription limits for memory, disk,
        and CPUs
        :returns: A Claim ticket representing the reserved resources.  This
        should be turned into finalize  a resource claim or free
        resources after the compute operation is finished.
        """
        image_meta = image_meta or {}

        if self.disabled:
            # compute_driver doesn't support resource tracking, just
            # generate the migration record and continue the resize:
            migration = self._create_migration(context, instance,
                                               instance_type)
            return claims.NopClaim(migration=migration)

        # get memory overhead required to build this instance:
        overhead = self.driver.estimate_instance_overhead(instance_type)
        LOG.debug("Memory overhead for %(flavor)d MB instance; %(overhead)d "
                  "MB", {'flavor': instance_type['memory_mb'],
                          'overhead': overhead['memory_mb']})

        instance_ref = instance_obj.compat_instance(instance)
        claim = claims.ResizeClaim(context, instance_ref, instance_type,
                                   image_meta, self, self.compute_node,
                                   overhead=overhead, limits=limits)

        migration = self._create_migration(context, instance_ref,
                                           instance_type)
        claim.migration = migration

        # Mark the resources in-use for the resize landing on this
        # compute host:
        self._update_usage_from_migration(context, instance_ref, image_meta,
                                              self.compute_node, migration)
        elevated = context.elevated()
        self._update(elevated, self.compute_node)

        return claim