AHA News And Trivia

2021-05-21 ARA: Static Initialization of Dynamically-Created System Objects at RTAS '21

Björn Fiedler presents our paper ARA: Static Initialization of Dynamically-Created System Objects at the 27th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS '21).

In the paper, we present ARA, a framework for static specialization of operating systems for embedded systems. ARA is capable to statically detect operating-system objects dynamically created during run-time and replace them by statically prepared equivalents. ARA is a major building block of our reserch project AHA towards the goal to fully automatically analyze and specialize applications and their system software.

The presentation videos, source code and evaluation artifacts are available at the paper's details page: ARA: Static Initialization of Dynamically-Created System Objects

2019-11-21 Tobias Landsberg Receives GI-FGBS Award for Best Master Thesis

Tobias Landsberg receives the award for best master thesis in the field of operating systems. The award is granted annually by the SIG on Operating Systems of the German Computer Assiciation (GI Fachgruppe Betriebssysteme) solely on the base of scientific excellence. It includes a price money of 500 €. Congrats, Tobias!

In his thesis Analyzing and Optimizing TLB-Induced Thread Migration Costs on Linux/ARM Tobias evaluates if it is feasable and benefitial to pre-warm the TLB (Translation Look-Aside Buffer) when a thread is migrated to another core. He analyzes existing ARM cores, presents and evaluates possible hardware extensions in gem5 and and provides a complete Linux integration for the system.

2019-07-09 Automatic Instance-Level Analysis in Real-Time Systems at OSPERT '19

Gerion Entrup presents our paper ARA: Automatic Instance-Level Analysis in Real-Time Systems at the 15th Workshop on Operating System Platforms for Embedded Real-Time Applications (OSPERT '19), in Stuttgart. In the paper we describe ARA, an analysis framework and tool to detect and visualize, how a given application employs RTOS abstractions. As a tool, ARA helps to understand how the tasks of an application given as source code interact which each other. The framework itself is an important building block towards our goal of fully automatic application analysis in the AHA project.

2018-12-14 Semi-Extended Tasks at RTSS 2018
Christian Dietrich presents the paper Semi-Extended Tasks: Efficient Stack Sharing Among Blocking Threads at the IEEE Real-Time Systems Symposium in Nashville, TE, USA (RTSS `18). In the paper we adress the problem of worst-case stack consumption (WCSC) in real-time systems that support preemption and blocking of threads. We refine the stack-sharing granularity from the thread to function level and provide an efficient intra-thread stack-switch mechanism as well as an ILP-based analysis approach to realize tight WCSC boundaries.
2018-07-03 Best Paper: Levels of Specialization in Real-Time Operating Systems at OSPERT '18

Björn Fiedler presents our paper Levels of Specialization in Real-Time Operating Systems was at the 14th Workshop on Operating System Platforms for Embedded Real-Time Applications (OSPERT '18), in Barcelona. In the paper we describe a taxonomy for the specialization of system software towards a specific application and provide showcases of the achievable benefits. We got an Best Paper Award for this work.

2017-11-21 New DFG Grant: Automated Hardware Abstraction in Operating-System Engineering
AHA: Automated Hardware Abstraction in Operating-System Engineering (DFG: LO 1719/4-1)
Goal of AHA is to improve nonfunctional properties of system software by a very deep, but fully automated specialization of the application-hardware bridge represented by the operating system. We investigate, how alternative implementations that are mapped more directly to hardware features, can be generated from a concrete application and their actual interactions with the operating system.
The German research foundation DFG is now supporting our AHA project for three years with two positions for doctoral researchers (E13), two positions for student researchers, and some additional lab equippment.
2017-06-22 The OSEK-V application-specific processor at LCTES 2017
Christian Dietrich presents the paper OSEK-V: Application-Specific RTOS Instantiation in Hardware at the ACM SIGPLAN / SIGBED Conference on Languages, Compilers, and Tools for Embedded Systems in Barcelona. In the paper we describe our approach to automatically tailor the RTOS functionality needed by an OSEK application to integrate it directly into the processor pipeline of the Rocket RISC-V core.
2017-04-18 Outstanding Paper: SysWCET at RTAS 2017
Christian Dietrich presented the paper SysWCET: Whole-System Response-Time Analysis for Fixed-Priority Real-Time Systems at the 2017 IEEE Real-Time and Embedded Technology and Applications Symposium in Pittsburgh. We got an Outstanding Paper Award for this work.
2017-04-01 Journal Paper on control-flow based RTOS optimization in TECS
Our paper Global Optimization of Fixed-Priority Real-Time Systems by RTOS-Aware Control-Flow Analysis finally appeared in issue 16.2 of ACM Transactions on Embedded Computing Systems. The paper is an extended version of our LCTES '15 paper Cross-Kernel Control-Flow-Graph Analysis for Event-Driven Real-Time Systems, where we originally described our approach to exploit the deterministic scheduling of OSEK and other event-driven RTOS to establish a global, cross-kernel/inter-task control flow analysis for aggressive tailoring and optimization. This journal version extends the original article by an algorithmic alternative that trades efficiency for precision and broader case studies.