Title: Flexible scheduling mechanisms in L4 Author: Simon Winwood School of Computer Science and Engineering, The University of New South Wales, Sydney 2052, Australia, sjw@cse.unsw.edu.au Abstract: This thesis presents the design, implementation, and evaluation of a new scheduling mechanism for the L4 \uk{}, running on the Alpha 21264 processor. This design concentrates on hierarchical resource management, by which an application is free to manage its own resources, enabling it to take advantage of domain specific knowledge. The final design, \emph{recursive scheduling}, extends easily to multi-processor systems, and benchmarking shows that the goals of the design were met successfully.