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* <code>EINVAL</code>: <code>op</code>=<code>FAIRSCHED_SET_RATE</code>, and the value of <code>rate</code> is out of the allowed range.
* <code>ENOENT</code>: the VE does not exist.
* <code>ENODATA</code>: <code>op</code>=<code>FAIRSCHED_SET_RATEFAIRSCHED_GET_RATE</code>, and the limit is not set (or was dropped).
* <code>EPERM</code>: the caller does not have permissions to modify the CPU parameters of the VE.