[_arvin]

It's essentially just applying these patches: https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt...

The above is for kernel 5.4, as the patchset for 5.5 doesn't exist at the time of this post.

After applying the patches, you'll want to run "make nconfig" or "make menuconfig" and search for CONFIG_PREEMPT_RT and enable it and you should be good to go. The only downside in my experience is Virtual Box doesn't work with the -rt kernel as of right now, so I can't use it as my daily driver. It is a my preferred kernel though for gaming and overall desktop use. I use a custom low-latency kernel when I'm not using the -rt and it's been working well for me.