Efficient utilization of idle resources in a resource manager

Embodiments are directed to dynamically allocating processing resources among a plurality of resource schedulers. A resource manager dynamically allocates resources to a first resource scheduler. The resource manager is configured to dynamically allocate resources among a plurality of resource schedulers, and each scheduler is configured to manage various processing resources. The resource manager determines that at least one of the processing resources dynamically allocated to the first resource scheduler is idle. The resource manager determines that at least one other resource scheduler needs additional processing resources and, based on the determination, loans the determined idle processing resource of the first resource scheduler to a second resource scheduler.