Does Java need "inline" types? What project Valhalla can bring to Java from a narrow view of performance engineer

Value types are the key part of experimental project Valhalla which should bring new abilities to Java language. It's a story not only about performance, it's also a story about safety, abstraction, expressiveness, maintainability, etc. But on this session we will talk about performance. Which performance benefits value types bring to Java and how we could exploit it.