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PWCS (Probabilistic Write / Copy-Select) is a new kind of lock-free synchronization mechanism with wait-free characteristics proposed by Nicholas Mc Guire at the 13th real-time Linux workshop, which utilizes the inherent randomness of the modern computer systems. It aims at addressing the multi-reader - single-writer problem in Linux. Based on the original label-based PWCS, we propose a hash-based...
In recent years, Network Function Virtualization (NFV) has gained a lot of traction from both industry and academia. NFV promotes vendor-independence and rapid evolution through open source software, open standards, and open APIs. However, adopting these principles for virtual middleboxes or Virtual Network Functions (VNFs) is not enough. The VNF orchestration systems also need to adopt the same principles,...
The use of an operating system (OS) is advocated as a means to simplify software development, freeing programmers from managing low-level hardware and providing a simpler programming interface for common tasks. The high complexity of modern desktop computers makes an OS indispensable; embedded systems, on the other hand, are limited architectures, usually severely cost- and power-constrained. Because...
Over the last decade, homogeneous multi-core processors emerged and became the de-facto approach for offering high parallelism, high performance and scalability for a wide range of platforms. We are now at an interesting juncture where several critical factors (smaller form factor devices, power challenges, need for specialization, etc) are guiding architects to consider heterogeneous chips and platforms...
We present the Digital Dash Reconfigurable Tactile Display (RTD), a projection-based multi-touch centre stack replacement for automobiles. After reviewing the system architecture, we detail the software challenges faced when developing touch screen software with limited computational resources.
In multicore processor, managing shared last level cache is important for overall system performance. Cache contention incurred by OS page caches is serious since the page caches are usually large but less likely reused. The non-reusable page caches, however, pollute the last level cache and interfere the performance of co-running memory-intensive applications. In this paper, we propose a new page...
We have developed an early prototype of an ARINC 653 implementation using the virtualization technology of the open source Xen hypervisor along with a Linux-based domain/partition OS. In this paper we share lessons learned from adding to our prototype both an ARINC 653 CPU scheduler and a simple ARINC 653 serial I/O driver. By using a common hypervisor technology on multiple platforms, early application...
Measuring reliability of embedded systems is an important but non-trivial problem. In a system design process, it is desirable to have early indicators for the reliability of an embedded system. Such reliability measurement will typically be carried out on system prototypes. The reliability measurements should thus be easy in set up, flexible to system changes, and hopefully low in cost. In the paper...
Security, simplicity, efficiency, are three important aspects of system architecture design, especially for dedicated security systems. The legacy horizontal-layered architectures (e.g., microkernel model) suffer from lacking of many desired features, such as flexibility, security and deployability. In this paper, we propose a new kernel model with vertical architecture, called ultra-kernel model,...
The emergence of functional embedded systems such as cell-phones and digital appliances brought up a new issue, building a system supporting both real-time and rich services. One of the solutions is leveraging a hypervisor to integrate an RTOS and a commodity OS into a single device. However, this approach induces the limitation of application deployment; all the high priority tasks should reside...
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