Summary: Accounting for Interrupts in Multiprocessor Real­Time Systems #
Bj˜ orn B. Brandenburg, Hennadiy Leontyev, and James H. Anderson
The University of North Carolina at Chapel Hill
Abstract
The importance of accounting for interrupts in multiproces­
sor real­time schedulability analsysis is discussed. Three in­
terrupt accounting methods, two of which are newly described
here, are analyzed and compared.
1 Introduction
System overheads such as time lost to task switches and
scheduling decisions must be accounted for in real­time sys­
tems if temporal correctness is to be guaranteed [12, 24]. Of
these overheads, interrupts are notoriously troublesome for
real­time systems since they are not subject to scheduling and
can significantly delay real­time tasks.
In work on uniprocessor real­time systems, methods have
been developed to account for interrupts under the two most­
commonly considered real­time scheduling policies: un­
der static­priority scheduling, interrupts can be analyzed as
higher­priority tasks [24], and under earliest­deadline­first

Source: Anderson, James - Department of Computer Science, University of North Carolina at Chapel Hill

Collections: Computer Technologies and Information Sciences