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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from dataclasses import dataclass
from oslo_log import log as logging
import nova.conf
from nova.virt.libvirt.cpu import core
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
@dataclass
class Core:
"""Class to model a CPU core as reported by sysfs.
It may be a physical CPU core or a hardware thread on a shared CPU core
depending on if the system supports SMT.
"""
# NOTE(sbauza): ident is a mandatory field.
# The CPU core id/number
ident: int
@property
def online(self) -> bool:
return core.get_online(self.ident)
@online.setter
def online(self, state: bool) -> None:
if state:
core.set_online(self.ident)
else:
core.set_offline(self.ident)
def __hash__(self):
return hash(self.ident)
def __eq__(self, other):
return self.ident == other.ident
@property
def governor(self) -> str:
return core.get_governor(self.ident)
def set_high_governor(self) -> None:
core.set_governor(self.ident, CONF.libvirt.cpu_power_governor_high)
def set_low_governor(self) -> None:
core.set_governor(self.ident, CONF.libvirt.cpu_power_governor_low)
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