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In many embedded real-time systems, applications often interact with I/Odevices via read/write operations, which may incur considerable suspensiondelays. Unfortunately, prior analysis methods for validating timing correctnessin embedded systems become quite pessimistic when suspension delays arepresent. In this paper, we consider the problem of supporting two common typesof I/O applications in a multiprocessor system, that is, write-onlyapplications and read-write applications. For the write-only application model,we present a much improved analysis technique that results in only O(m)suspension-related utilization loss, where m is the number of processors. Forthe second application model, we present a flexible I/O placement strategy anda corresponding new scheduling algorithm, which can completely circumvent thenegative impact due to read- and write-induced suspension delays. We illustratethe feasibility of the proposed I/O-placement-based schedule via a case studyimplementation. Furthermore, experiments presented herein show that theimprovement with respect to system utilization over prior methods is oftensignificant.

Supporting Read/Write Applications in Embedded Real-time Systems via Suspension-aware Analysis