diff options
Diffstat (limited to 'nova/virt/libvirt/host.py')
| -rw-r--r-- | nova/virt/libvirt/host.py | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/nova/virt/libvirt/host.py b/nova/virt/libvirt/host.py index b986702401..6820cca920 100644 --- a/nova/virt/libvirt/host.py +++ b/nova/virt/libvirt/host.py @@ -1635,15 +1635,44 @@ class Host(object): CONFIG_CGROUP_SCHED may be disabled in some kernel configs to improve scheduler latency. """ + return self._has_cgroupsv1_cpu_controller() or \ + self._has_cgroupsv2_cpu_controller() + + def _has_cgroupsv1_cpu_controller(self): + LOG.debug(f"Searching host: '{self.get_hostname()}' " + "for CPU controller through CGroups V1...") try: with open("/proc/self/mounts", "r") as fd: for line in fd.readlines(): # mount options and split options bits = line.split()[3].split(",") if "cpu" in bits: + LOG.debug("CPU controller found on host.") + return True + LOG.debug("CPU controller missing on host.") + return False + except IOError as ex: + LOG.debug(f"Search failed due to: '{ex}'. " + "Maybe the host is not running under CGroups V1. " + "Deemed host to be missing controller by this approach.") + return False + + def _has_cgroupsv2_cpu_controller(self): + LOG.debug(f"Searching host: '{self.get_hostname()}' " + "for CPU controller through CGroups V2...") + try: + with open("/sys/fs/cgroup/cgroup.controllers", "r") as fd: + for line in fd.readlines(): + bits = line.split() + if "cpu" in bits: + LOG.debug("CPU controller found on host.") return True + LOG.debug("CPU controller missing on host.") return False - except IOError: + except IOError as ex: + LOG.debug(f"Search failed due to: '{ex}'. " + "Maybe the host is not running under CGroups V2. " + "Deemed host to be missing controller by this approach.") return False def get_canonical_machine_type(self, arch, machine) -> str: |