# 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](https://elixir.bootlin.com/linux/v5.7.1/source/kernel/Kconfig.preempt#L38).

“RT”, on version 4.19, means that the kernel was built as a fully preemptible (real-time) kernel, using [the Preempt RT](https://wiki.linuxfoundation.org/realtime/start) 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.


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