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On vertical polarization, kernel can be adjusting CPU capacities dynamically, and cpuplugd can interfere this with hotplug operations causing performance degradation. To prevent this, check if system has switched its polarization state, and act accordingly. If system is on vertical polarization when daemon starts, no CPU hotplug action is triggered. If system changes to vertical polarization during daemon runtime, revert cpuhotplug adjustments and stop further CPU hotplug actions. If system switches back to horizontal polarization during runtime of the daemon, start evaluating CPU hotplug rules and trigger adjustments. Reviewed-by: Steffen Eiden <seiden@linux.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Signed-off-by: Mete Durlu <meted@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>