A method of system resource management. The method including: determining a class of a device agent and determining whether the device agent is requesting a controlled system resource or a non-controlled system resource. If a controlled system resource is requested by the device agent, then the method further includes determining whether a first amount of the controlled system resource requested by the device agent plus a second amount of the controlled system resource currently consumed by the class of the device agent, if any, together exceed a class allocation amount for the controlled system resource that is permissible for the class of the device agent to consume.