Cost and Benefit of Separate Address Spaces in Real-Time Operating Systems

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Cost and Benefit of Separate Address Spaces in Real-Time Operating Systems (2002)

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by Frank Mehnert , Michael Hohmuth , Hermann Härtig

Venue:	IN PROCEEDINGS OF THE 23RD IEEE REAL-TIME SYSTEMS SYMPOSIUM (RTSS
Citations:	21 - 3 self

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@INPROCEEDINGS{Mehnert02costand,
    author = {Frank Mehnert and Michael Hohmuth and Hermann Härtig},
    title = {Cost and Benefit of Separate Address Spaces in Real-Time Operating Systems},
    booktitle = {IN PROCEEDINGS OF THE 23RD IEEE REAL-TIME SYSTEMS SYMPOSIUM (RTSS},
    year = {2002},
    publisher = {}
}

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Abstract

The combination of a real-time executive and an off-theshelf time-sharing operating system has the potential of providing both predictability and the comfort of a large application base. To isolate the real-time section from a significant class of faults in the (ever-growing) time-sharing operating system, address spaces can be used to encapsulate the time-sharing subsystem. However, in practice designers seldomly use address spaces for this purpose, fearing that extra cost induced thereby limits the system's predictability. To analyze this cost, we compared in detail two systems with almost identical interfaces---both are a combination of the Linux operating system and a small real-time executive. Our analysis revealed that for interrupt-response times, the delay and jitter caused by address spaces are similar to or even smaller than those caused by caches and blocked interrupts. As a side effect of our analysis, we observed that published figures on predictability must be carefully checked whether or not such hardware features are included in the analysis. This

Keyphrases

separate address space real-time operating system address space time-sharing subsystem off-theshelf time-sharing operating system significant class interrupt-response time identical interface time-sharing operating system extra cost small real-time executive practice designer hardware feature side effect large application base real-time section real-time executive linux operating system

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