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Fixed priority scheduling with pre-emption thresholds and cache-related pre-emption delays: integrated analysis and evaluation

Commercial off-the-shelf programmable platforms for real-time systems typically contain a cache to bridge the gap between the processor speed and main memory speed. Because cache-related pre-emption delays (CRPD) can have a significant influence on the computation times of tasks, CRPD have been inte... Full description

Main Author: Bril, J.
Contributors: Altmeyer, Sebastian
Heuvel, P.
Davis, I.
Behnam, Moris
Contained in: Real-time systems : the international journal of time-critical computing systems Dordrecht [u.a.] : Springer Science + Business Media B.V Vol. 53, No. 4 (2017), p. 403-466
Journal Title: Real-time systems : the international journal of time-critical computing systems
Fulltext access: Fulltext access (direct link - free access) 10.1007/s11241-016-9266-z
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Links: Volltext (dx.doi.org)
ISSN: 1573-1383
Keywords: Cache-related pre-emption delay
Fixed-priority pre-emptive scheduling
Fixed-priority scheduling with pre-emption thresholds
OriginalPaper
Response-time analysis
DOI: 10.1007/s11241-016-9266-z
Language: English
Notes: Open Access
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/s11241-016-9266-z
s11241-016-9266-z
PPN (Catalogue-ID): SPR058955828
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520 |a Commercial off-the-shelf programmable platforms for real-time systems typically contain a cache to bridge the gap between the processor speed and main memory speed. Because cache-related pre-emption delays (CRPD) can have a significant influence on the computation times of tasks, CRPD have been integrated in the response time analysis for fixed-priority pre-emptive scheduling (FPPS). This paper presents CRPD aware response-time analysis of sporadic tasks with arbitrary deadlines for fixed-priority pre-emption threshold scheduling (FPTS), generalizing earlier work. The analysis is complemented by an optimal (pre-emption) threshold assignment algorithm, assuming the priorities of tasks are given. We further improve upon these results by presenting an algorithm that searches for a layout of tasks in memory that makes a task set schedulable. The paper includes an extensive comparative evaluation of the schedulability ratios of FPPS and FPTS, taking CRPD into account. The practical relevance of our work stems from FPTS support in AUTOSAR, a standardized development model for the automotive industry. [(This paper forms an extended version of Bril et al. (in Proceedings of 35th IEEE real-time systems symposium (RTSS), 2014). The main extensions are described in Sect. 1.2.] 
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