LinuxPR: MontaVista Enables Seamless Real-Time Scheduler For LinuxMay 04, 2000, 13:30 (2 Talkback[s])
"Scheduler plug-in expands Linux application space; offers real-time priorities while preserving Linux programming model"
"MontaVista Software, Inc., supplier of Hard Hat Linux for embedded applications, today announces the availability of a new real-time scheduler for the Linux kernel. The MontaVista real-time scheduler gives developers of embedded applications new options for meeting real-time performance requirements while preserving the standard Linux programming model and Application Programming Interfaces (APIs)."
"In contrast to other real-time add-ons to Linux, the MontaVista real-time solution does not introduce a second kernel underneath Linux, nor does it attempt to substitute so-called "Linux-compatible" real-time operating system (RTOS) components for Linux itself. Rather, the MontaVista real-time scheduler is integrated into the standard Linux kernel, fully realizing the already-present "real-time" scheduling policies, but with enforced hard prioritization. The benefit to embedded Linux applications is twofold. First, applications with real-time requirements behave more predictably and reliably. Second, developers can still leverage the standard Linux APIs and memory-protected programming models, resulting in shorter development cycles, better code reuse and high reliability."
"The MontaVista scheduler, which executes before the standard Linux scheduler, optimizes Linux process/thread scheduling by only examining and dispatching the highest priority real-time entity that is ready to run. Unlike the Linux scheduler, overhead for process selection is fixed, yielding extremely high performance. If no real-time entity is available for execution, or none has been specified as real-time, then scheduling falls through to the standard scheduler and fairness-based scheduling proceeds apace. "Everyone benefits from a fully transparent solution," states Kevin Morgan, MontaVista Software vice-president of engineering. "Our real-time scheduler doesn't force the developer to learn another OS in order to build predictable embedded applications - we just help Linux accomplish the real-time mission using time-tested open Linux APIs and programming paradigms." Morgan adds that he and his engineering team look forward to feedback from the open-source community in response to releasing this technology."
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