General control-theoretical framework for online resource allocation in computing systems

System-theoretical methods are already used for the control of computing systems, but much more can be done exploiting said methods for their `design`. This requires to express in control-theoretical terms desires and specifications that originate in the computer science domain, which may not be immediate. It also requires to accept that part of the addressed system be modified, which may pose some acceptance problems. However, if those issues are handled correctly, the payback is often very relevant. This study demonstrates the above ideas in the context of resource allocation.