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Rollup merge of #136858 - safinaskar:parallel-cleanup-2025-02-11-07-54, r=SparrowLii 

Parallel-compiler-related cleanup

Parallel-compiler-related cleanup

I carefully split changes into commits. Commit messages are self-explanatory. Squashing is not recommended.

cc "Parallel Rustc Front-end" https://github.com/rust-lang/rust/issues/113349

r? SparrowLii

``@rustbot`` label: +WG-compiler-parallel
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@ -46,8 +46,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
| data structure | parallel | non-parallel | | data structure | parallel | non-parallel |
| -------------------------------- | --------------------------------------------------- | ------------ | | -------------------------------- | --------------------------------------------------- | ------------ |
| Weak | std::sync::Weak | std::rc::Weak |
| Atomic{Bool}/{Usize}/{U32}/{U64} | std::sync::atomic::Atomic{Bool}/{Usize}/{U32}/{U64} | (std::cell::Cell<bool/usize/u32/u64>) |
| OnceCell | std::sync::OnceLock | std::cell::OnceCell | | OnceCell | std::sync::OnceLock | std::cell::OnceCell |
| Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) | | Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) |
| RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) | | RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) |
@ -58,7 +56,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
| WriteGuard | parking_lot::RwLockWriteGuard | std::cell::RefMut | | WriteGuard | parking_lot::RwLockWriteGuard | std::cell::RefMut |
| MappedWriteGuard | parking_lot::MappedRwLockWriteGuard | std::cell::RefMut | | MappedWriteGuard | parking_lot::MappedRwLockWriteGuard | std::cell::RefMut |
| LockGuard | parking_lot::MutexGuard | std::cell::RefMut | | LockGuard | parking_lot::MutexGuard | std::cell::RefMut |
| MappedLockGuard | parking_lot::MappedMutexGuard | std::cell::RefMut |
- These thread-safe data structures are interspersed during compilation which - These thread-safe data structures are interspersed during compilation which
can cause lock contention resulting in degraded performance as the number of can cause lock contention resulting in degraded performance as the number of
@ -173,12 +170,10 @@ Here are some resources that can be used to learn more:
- [This list of interior mutability in the compiler by nikomatsakis][imlist] - [This list of interior mutability in the compiler by nikomatsakis][imlist]
[`rayon`]: https://crates.io/crates/rayon [`rayon`]: https://crates.io/crates/rayon
[Arc]: https://doc.rust-lang.org/std/sync/struct.Arc.html
[imlist]: https://github.com/nikomatsakis/rustc-parallelization/blob/master/interior-mutability-list.md [imlist]: https://github.com/nikomatsakis/rustc-parallelization/blob/master/interior-mutability-list.md
[irlo0]: https://internals.rust-lang.org/t/parallelizing-rustc-using-rayon/6606 [irlo0]: https://internals.rust-lang.org/t/parallelizing-rustc-using-rayon/6606
[irlo1]: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503 [irlo1]: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503
[monomorphization]: backend/monomorph.md [monomorphization]: backend/monomorph.md
[parallel-rustdoc]: https://github.com/rust-lang/rust/issues/82741 [parallel-rustdoc]: https://github.com/rust-lang/rust/issues/82741
[Rc]: https://doc.rust-lang.org/std/rc/struct.Rc.html
[rustc-rayon]: https://github.com/rust-lang/rustc-rayon [rustc-rayon]: https://github.com/rust-lang/rustc-rayon
[tracking]: https://github.com/rust-lang/rust/issues/48685 [tracking]: https://github.com/rust-lang/rust/issues/48685