RT-5种模式
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He goes through the following key points during the presentation:
Real-time OS definition – Deterministic, does not mean fast (but still nice), meet deadlines.
Goal of PREEMP_RT – 100% Preemptible kernel and quick reaction
Different levels of preemption in Linux:
No preemption – Do as most possible with as little scheduling overhead. Use for server in Linux 2.4
Voluntary preemption – Schedule only at “preemption points”
Preemptible Kernel – CONFIG_PREEMPT. Preempt anywhere except within spin_locks
Preemptible Kernel (Basic RT) – For debugging, it will most probably go away…
Fully Preemptible Kernel – PREEMPT_RT_FULL. Preempts everywhere except from preempt_disable and interrupts disabled.
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