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Implement user fault handling with userfaultfd on Linux.

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This commit implements the `uffd` feature which turns on support for utilizing
the `userfaultfd` system call on Linux for the pooling instance allocator.

By handling page faults in userland, we are able to detect guard page accesses
without having to constantly change memory page protections.

This should help reduce the number of syscalls as well as kernel lock
contentions when many threads are allocating and deallocating instances.

Additionally, the user fault handler can lazy initialize linear
memories of an instance (implementation to come).
This commit is contained in:
Peter Huene
2021-02-10 20:29:20 -08:00
parent e71ccbf9bc
commit a2c439117a
8 changed files with 874 additions and 8 deletions
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.github/workflows/main.yml vendored
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@@ -122,6 +122,7 @@ jobs:
- run: cargo check --manifest-path crates/wasmtime/Cargo.toml --features jitdump
- run: cargo check --manifest-path crates/wasmtime/Cargo.toml --features cache
- run: cargo check --manifest-path crates/wasmtime/Cargo.toml --features async
- run: cargo check --manifest-path crates/wasmtime/Cargo.toml --features uffd
# Check some feature combinations of the `wasmtime-c-api` crate
- run: cargo check --manifest-path crates/c-api/Cargo.toml --no-default-features