86 lines
3.1 KiB
Python
86 lines
3.1 KiB
Python
# Copyright 2013 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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from oslo.config import cfg
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from nova import exception
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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virt_cpu_opts = [
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cfg.StrOpt('vcpu_pin_set',
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help='Defines which pcpus that instance vcpus can use. '
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'For example, "4-12,^8,15"',
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deprecated_group='libvirt'),
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]
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CONF = cfg.CONF
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CONF.register_opts(virt_cpu_opts)
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def get_cpuset_ids():
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"""Parsing vcpu_pin_set config.
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Returns a list of pcpu ids can be used by instances.
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"""
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if not CONF.vcpu_pin_set:
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return None
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cpuset_ids = set()
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cpuset_reject_ids = set()
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for rule in CONF.vcpu_pin_set.split(','):
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rule = rule.strip()
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# Handle multi ','
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if len(rule) < 1:
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continue
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# Note the count limit in the .split() call
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range_parts = rule.split('-', 1)
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if len(range_parts) > 1:
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# So, this was a range; start by converting the parts to ints
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try:
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start, end = [int(p.strip()) for p in range_parts]
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except ValueError:
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raise exception.Invalid(_("Invalid range expression %r")
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% rule)
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# Make sure it's a valid range
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if start > end:
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raise exception.Invalid(_("Invalid range expression %r")
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% rule)
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# Add available pcpu ids to set
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cpuset_ids |= set(range(start, end + 1))
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elif rule[0] == '^':
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# Not a range, the rule is an exclusion rule; convert to int
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try:
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cpuset_reject_ids.add(int(rule[1:].strip()))
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except ValueError:
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raise exception.Invalid(_("Invalid exclusion "
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"expression %r") % rule)
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else:
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# OK, a single PCPU to include; convert to int
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try:
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cpuset_ids.add(int(rule))
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except ValueError:
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raise exception.Invalid(_("Invalid inclusion "
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"expression %r") % rule)
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# Use sets to handle the exclusion rules for us
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cpuset_ids -= cpuset_reject_ids
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if not cpuset_ids:
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raise exception.Invalid(_("No CPUs available after parsing %r") %
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CONF.vcpu_pin_set)
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# This will convert the set to a sorted list for us
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return sorted(cpuset_ids)
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