Using interpreted CompositeCalls to improve operating systems services

F. J. Ballesteros , Ricardo Jimenez, Marta Pati~ no, Fabio Kon, Sergio Arevalo, and Roy Campbell 1 Systems and Communications Group. Rey Juan Carlos University of Madrid. C/ Tulipan E-28933 Mostoles, Madrid (Spain). email: fnemo,sarevalog@gsyc.escet.urjc.es 2 Facultad de Informatica. Technical University of Madrid, E-28660 Boadilla del Monte, Madrid (Spain). email: frjimenez,mpatinog@fi.upm.es 3 Systems Research Group. Digital Computer Lab. University of Illinois at Urbana-Champaign. 1304 W Spring eld Av. Urbana, IL 61801 (USA). email: ff-kon,rhcg@cs.uiuc.edu