1. A system for determining a CPU usage adjustment factor for a computing unit running a thread-aware operating system, the system comprising: at least one subsystem configured to sample reported CPU usage for the computing unit running the thread-aware operating system, the sampling being performed at a predefined sampling rate and sampling interval; at least one subsystem configured to determine thread states for one or more processors of the computing unit, the thread states substantially corresponding to the sampled CPU usage; and at least one subsystem configured to derive a CPU usage adjustment factor for the computing unit from the sampled CPU usage and the thread states substantially corresponding to the sampled CPU usage.