openstack/nova
Code Issues Proposed changes

cpu: Only check governor type on online cores

Browse Source 
Kernels don't accept to access the governor strategy on an offline core, so
we need to only validate strategies for online cores.

Change-Id: I14c9b268d0b97221216bd1a9ab9e48b48d6dcc2c
Closes-Bug: #2073528
This commit is contained in:
Sylvain Bauza 2024-07-18 19:08:49 +02:00
parent e82854dc8c
commit 757c333c0e
2 changed files with 25 additions and 5 deletions
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18
nova/tests/unit/virt/libvirt/cpu/test_api.py
View File

@ -244,3 +244,21 @@ class TestAPI(test.NoDBTestCase):
self.api.validate_all_dedicated_cpus()
# no assert we want to make sure the validation won't raise if
# no dedicated cpus are configured
@mock.patch.object(core, 'get_governor')
@mock.patch.object(core, 'get_online')
def test_validate_all_dedicated_cpus_for_cpu_state_with_off_cores(
self, mock_get_online, mock_get_governor):
self.flags(cpu_power_management=True, group='libvirt')
self.flags(cpu_dedicated_set='1-3', group='compute')
self.flags(cpu_power_management_strategy='cpu_state', group='libvirt')
# CPU1 and CPU3 are online while CPU2 is offline
mock_get_online.side_effect = (True, False, True)
mock_get_governor.return_value = 'performance'
self.api.validate_all_dedicated_cpus()
mock_get_online.assert_has_calls([mock.call(1), mock.call(2),
mock.call(3)])
# we only have two calls as CPU2 was skipped
mock_get_governor.assert_has_calls([mock.call(1),
mock.call(3)])

12
nova/virt/libvirt/cpu/api.py
View File

@ -172,8 +172,7 @@ class API(object):
if not CONF.libvirt.cpu_power_management:
return
cpu_dedicated_set = hardware.get_cpu_dedicated_set() or set()
governors = set()
cpu_states = set()
pcpus = []
for pcpu in cpu_dedicated_set:
if (pcpu == 0 and
CONF.libvirt.cpu_power_management_strategy == 'cpu_state'):
@ -181,11 +180,13 @@ class API(object):
'but it is not eligible for state management '
'and will be ignored')
continue
pcpu = self.core(pcpu)
# we need to collect the governors strategy and the CPU states
governors.add(pcpu.governor)
cpu_states.add(pcpu.online)
pcpus.append(self.core(pcpu))
if CONF.libvirt.cpu_power_management_strategy == 'cpu_state':
# NOTE(sbauza): offline cores can't have a governor, it returns a
# DeviceBusy exception.
governors = set([pcpu.governor for pcpu in pcpus
if pcpu.online])
# all the cores need to have the same governor strategy
if len(governors) > 1:
msg = _("All the cores need to have the same governor strategy"
@ -193,6 +194,7 @@ class API(object):
"compute node if you prefer.")
raise exception.InvalidConfiguration(msg)
elif CONF.libvirt.cpu_power_management_strategy == 'governor':
cpu_states = set([pcpu.online for pcpu in pcpus])
# all the cores need to be online
if False in cpu_states:
msg = _("All the cores need to be online before modifying the "