Towards effective user-controlled scheduling for microkernel-based systems
ACM SIGOPS Operating Systems Review
A real-time programmer's tour of general-purpose L4 microkernels
EURASIP Journal on Embedded Systems - Operating System Support for Embedded Real-Time Applications
A real-time programmer's tour of general-purpose L4 microkernels
EURASIP Journal on Embedded Systems - Operating System Support for Embedded Real-Time Applications
A communication mechanism for resource isolation
Proceedings of the Second Workshop on Isolation and Integration in Embedded Systems
Experiences with client/server interactions in a reservation-based system
Proceedings of the 27th Annual ACM Symposium on Applied Computing
Analysis of client/server interactions in a reservation-based system
Proceedings of the 28th Annual ACM Symposium on Applied Computing
Proceedings of the Twenty-Fourth ACM Symposium on Operating Systems Principles
ACM SIGOPS 24th Symposium on Operating Systems Principles
From L3 to seL4 what have we learnt in 20 years of L4 microkernels?
Proceedings of the Twenty-Fourth ACM Symposium on Operating Systems Principles
Predictable and configurable component-based scheduling in the Composite OS
ACM Transactions on Embedded Computing Systems (TECS) - Special Section on ESTIMedia'10
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Open real-time systems provide for co-hosting hard-, soft- and non-real-time applications. Microkernel-based designs in addition allow for these applications to be mutually protected. Thus, trusted servers can coexist next to untrusted applications. These systems place a heavy burden on the performance of the message-passing mechanism, especially when based on microkernel-like inter-process communication. In this paper we introduce capacity-reserve donation (in short Credo), a mechanism for the fast interaction of interdependent components, which is applicable to common real-time resource-access models. We implemented Credo by extending L4ýs message-passing mechanism to provide proper resource accounting and time-donation control, thereby preserving desired real-time properties. We were able to achieve priority inheritance and stackbased priority-ceiling resource sharing with virtually no overhead added to L4ýs message-passing implementation. By providing a mechanism that does not impose performance penalties, while still guaranteeing correct real-time behaviour, Credo allows for the usage of microkernels in general-purpose but also in specialized systems.