[kccqzy]

In a nutshell, you can create a region and add data to this region and the GC will never look inside it. That is, as long as there is one external reference to any object in this region, the whole region will be kept alive. This is most useful when you know beforehand that you will never deallocate this region of data anyway: it reduces GC latency. Another benefit is that this region can then be serialized to disk efficiently. Deserialization is pretty efficient as it involves as loading the whole thing into memory and fixing up pointers. Reminds me of the Emacs dump[1] though.

[1]: https://lwn.net/Articles/673724/