df886d4a2d
### What? Remove the `MADV_UNMERGEABLE` (Unmergeable) mmap advice from `turbo-persistence`'s `advise_mmap_for_persistence` helper in `mmap_helper.rs`. ### Why? The WSL (Windows Subsystem for Linux) kernel does not support `MADV_UNMERGEABLE` and returns an error when it is applied, causing turbo-persistence to fail on WSL. See: https://x.com/von_cronen/status/2034944304712392891 Additionally, `MADV_UNMERGEABLE` is already the **default** state for memory pages — KSM (Kernel Same-page Merging) is opt-in via `MADV_MERGEABLE`. Explicitly setting `MADV_UNMERGEABLE` on pages that were never marked mergeable is a no-op on standard kernels, so the call provides no benefit while breaking WSL users. The `MADV_DONTFORK` advice is retained, as it has a clear correctness benefit (prevents mmap regions from being inherited by child processes on `fork()`). ### How? Removed the `mmap.advise(memmap2::Advice::Unmergeable)` call and its associated doc comment from `turbopack/crates/turbo-persistence/src/mmap_helper.rs`. Co-authored-by: Tobias Koppers <[email protected]> Co-authored-by: Claude <[email protected]>
Next.js
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