2a24a0fbde
As a followup to the recent memfd allocator work, this PR makes the memfd image creation occur on the first instantiation, rather than immediately when the `Module` is loaded. This shaves off a potentially surprising cost spike that would have otherwise occurred: prior to the memfd work, no allocator eagerly read the module's initial heap state into RAM. The behavior should now more closely resemble what happened before (and the improvements in overall instantiation time and performance, as compared to either eager init with pure-mmap memory or user-mode pagefault handling with uffd, remain).
Wasmtime Embedding API
The wasmtime crate is an embedding API of the wasmtime WebAssembly runtime.
This is intended to be used in Rust projects and provides a high-level API of
working with WebAssembly modules.
If you're interested in embedding wasmtime in other languages, you may wish to
take a look a the C embedding API instead!