Basically anywhere you'd previously need to write a kernel module but now can have user space run arbitrary kernel code that's secure and won't crash the kernel.
You can also now write custom schedulers in eBPF with sched_ext.
Can you provide data on motorcycle engines? I do believe this to be true for 2-strokes and older motorcycles, but for modern Euro-4/5 regulated street motorcycles I very much doubt it.
It's the kind of attitude you kinda have to have at that scale, otherwise it's very hard to balance your time between shipping features or fixing issues (you end up biasing towards one side or the other for the detriment of the overall product/team).
I think Production Engineering is especially interesting to me as I think we do a very good job of lowering the wall between ops and dev, mostly we build tools and do evangelism to help SWEs own their own services, but above all we do whatever is necessary to keep the site up in the most scalable way we possibly can. This includes engaging with our product engineers, not just infrastructure, and helping them understand the impact of product on infra and vice versa. That's one thing I especially like about PE, there is very little of the ops/dev divide, it's more of a partnership with PE and SWE both helping to own the service in production. (disclosure, I work at FB as a PE)
I didn't say that GlusterFS was the first to do it, just always liked the simplicity of the design. It makes hacking on the internals extremely easily to reason about.
The design of this seems very similar to GlusterFS, which has a very elegant design. It just acts as a translation layer for normal POSIX syscalls and forwards those calls to daemons running on each storage host, which then reproduces the syscalls on disk. This seems like very much the same thing except using git operations.
Basically anywhere you'd previously need to write a kernel module but now can have user space run arbitrary kernel code that's secure and won't crash the kernel.
You can also now write custom schedulers in eBPF with sched_ext.