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KernelTrap: Discussions on Real Time

Oct 13, 2004, 07:00 (0 Talkback[s])

Real Time Kernel Prototype

"Sven-Thorsten Dietrich for MontaVista announced a set of patches that he called 'prototype real-time (RT) enhancements to the Linux 2.6 kernel.' The enhancements are a collection of features integrated together, including Ingo Molnar's voluntary preemption and BKL mutex patches, and a mutex abstraction layer for implementing spinlocks with mutexes. Sven explains, 'the purpose of this effort is to to further reduce interrupt latency and to dramatically reduce task preemption latency in the 2.6 kernel series. Our broad objective is to achieve preemption latency bounded by the worst case IRQ disable.' He goes on to add, 'our objective is to enable the Linux 2.6 kernel to be usable for high-performance multi-media applications and for applications requiring very fast, task level reliable control functions...'"

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Realtime Preemption

"Since his first announcement of voluntary kernel preemption, Ingo Molnar has continued to work on reducing overall latencies in the kernel. His latest -T4 patch introduces a new kernel configuration option about which he says, 'the big change in this release is the addition of PREEMPT_REALTIME, which is a new implementation of a fully preemptible kernel model' in which 'spinlocks and rwlocks use semaphores and are preemptible by default,' and 'the _irq variants of these locks do not disable interrupts but rely on IRQ threading to exclude against interrupt contexts...'"

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