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Map large executables' text with 2 MiB pages

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Chris Tate
2026-10-27 15:04:45 -05:00
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docs/content/docs/platforms.mdx
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@@ -53,6 +53,8 @@ fib-linux: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically
Linux executables use the native Linux implementations of the event loop (epoll), servers, TLS (with the system's CA bundle), and `fs.watch`, and they are tested against Node.js on Linux, including Alpine.
An executable with at least 4 MiB of program code is linked with 2 MiB segment alignment when lld or zig links it, so the kernel can map its code with 2 MiB pages instead of 4 KiB pages. This takes effect when transparent huge pages are set to `madvise` or `always` and the file system keeps files in the page cache as 2 MiB folios (XFS, for example). scriptc writes such an executable with one write so that the page cache holds it that way; a copy written in small chunks maps with 4 KiB pages until it is read from disk again. The alignment also aligns the executable's load address to 2 MiB, which leaves 19 bits of address randomization for it instead of 28. Smaller executables, and links by GNU ld, keep 4 KiB alignment.
### Windows (x86_64)
```console