Ok, but you do realize that you're now deep in the realm of real time Linux and you're supposed to allocate entire CPU cores to individual processes?

What I'm trying to express here is that the spinlock isn't some special tool that you pull out of the toolbox to make something faster and call it a day.

It's like a cryogenic superconductor that requires extreme caution to use properly. It's something you avoid doing because it's a pain in the ass.