SMP PREEMPT_DYNAMIC Definitions

Summary

“SMP” means that the kernel was built with support for SMP (symmetric multi-processing).

“PREEMPT” means that the kernel was built as a preemptible kernel.

“RT”, on version 4.19, means that the kernel was built as a fully preemptible (real-time) kernel, using the Preempt RT patches.

Long Definitions

"SMP PREEMPT_DYNAMIC" refers to a Linux kernel configuration option that enables the Symmetric Multiprocessing (SMP) support with dynamic preemption. Let's break down the components:

1. SMP (Symmetric Multiprocessing): SMP refers to a computer architecture that allows multiple processors or cores to work together on a single system. With SMP support enabled, the Linux kernel can effectively utilize multiple processors, distributing tasks among them for improved performance and concurrency.

2. PREEMPT: Preemption in the context of the Linux kernel refers to the ability to interrupt a running task before its completion and switch to another task. Preemption allows for better responsiveness, especially in scenarios where multiple tasks are competing for system resources.

3. DYNAMIC: The "PREEMPT_DYNAMIC" option indicates that the Linux kernel can dynamically determine when to preempt a running task based on predefined criteria. This approach allows for more flexibility and fine-grained control over task preemption.

Combining these elements, "SMP PREEMPT_DYNAMIC" signifies a kernel configuration that enables support for symmetric multiprocessing, allowing multiple processors to work together, while also incorporating dynamic preemption for better responsiveness and resource utilization.