![]() Enabling context switches while executing processes in the Kernel Mode that the kernel must protect from preemption could thus result in corrupted data. For instance, a higher-priority process may attempt to modify a shared in-kernel data structure previously accessed by a lower-priority, preempted process. The challenge in making a fully preemptive kernel is knowing where preempting the current execution thread will have catastrophic consequences. Rendering the Linux kernel preemptible essentially meant enabling the assignment of the CPU to a higher-priority task, even though the processor was already executing some kernel routine in Kernel Mode that had neither been blocked nor completed. ![]() In a preemptible kernel, a process can preempt an instance of a running program, forcibly interrupting the CPU and performing a context switch. Preemption in industrial embedded systems If preemption in the Linux kernel caught you off guard and you need a quick refresher, keep reading. If the above makes perfect sense to you, stay tuned for Part III of this three-part blog series, where we will explore the considerations behind adopting low-latency Linux for your industrial embedded application. ![]() ![]() Consequently, it services most low-jitter and low-latency workloads and is a good fit for industrial embedded applications with latency requirements in the milliseconds’ range. The low-latency Ubuntu kernel ships with a 1000 Hz tick timer granularity ( CONFIG_HZ_1000) and the maximum preemption ( CONFIG_PREEMPT) available in the mainline Linux kernel. In case you missed it, check out Part I for a brief intro on preemptable processes in multiuser systems and memory split into kernel and user space. Welcome to Part II of this three-part blog series on adopting the low latency Linux kernel for your embedded systems. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |