2026-08-08T00:00:25Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:9001 2024-03-12T11:57:52Z ddc:004 open_access

Deterministic Memory Abstraction and Supporting Multicore System Architecture Farshchi, Farzad Valsan, Prathap Kumar Mancuso, Renato Yun, Heechul multicore processors real-time shared cache DRAM controller Linux Poor time predictability of multicore processors has been a long-standing challenge in the real-time systems community. In this paper, we make a case that a fundamental problem that prevents efficient and predictable real-time computing on multicore is the lack of a proper memory abstraction to express memory criticality, which cuts across various layers of the system: the application, OS, and hardware. We, therefore, propose a new holistic resource management approach driven by a new memory abstraction, which we call Deterministic Memory. The key characteristic of deterministic memory is that the platform-the OS and hardware-guarantees small and tightly bounded worst-case memory access timing. In contrast, we call the conventional memory abstraction as best-effort memory in which only highly pessimistic worst-case bounds can be achieved. We propose to utilize both abstractions to achieve high time predictability but without significantly sacrificing performance. We present deterministic memory-aware OS and architecture designs, including OS-level page allocator, hardware-level cache, and DRAM controller designs. We implement the proposed OS and architecture extensions on Linux and gem5 simulator. Our evaluation results, using a set of synthetic and real-world benchmarks, demonstrate the feasibility and effectiveness of our approach. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Farzad Farshchi and Prathap Kumar Valsan and Renato Mancuso and Heechul Yun 2018 Is Part Of LIPIcs, Volume 106, 30th Euromicro Conference on Real-Time Systems (ECRTS 2018) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.ECRTS.2018.1 urn:nbn:de:0030-drops-90010 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2018.1 eng https://creativecommons.org/licenses/by/3.0/legalcode