docs(audits): fast_io fallback macOS vs Linux io_uring#3722
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Static, code-grounded audit of the fast_io fallback on macOS compared to the Linux io_uring path and the post-#1868 Windows IOCP path. Inventories every public copy/write/probe entry point with file:LINE, documents the inferred per-file syscall budget, identifies which io_uring features have no macOS analogue, and ranks the near-term mitigations (#1657 pwritev+F_NOCACHE, #1385 kqueue backend, macOS sendfile arm) by inferred payoff per unit of effort.
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Static, code-grounded audit of the fast_io fallback on macOS compared to the Linux io_uring path and the post-#1868 Windows IOCP path. Inventories every public copy/write/probe entry point with file:LINE, documents the inferred per-file syscall budget, identifies which io_uring features have no macOS analogue, and ranks the near-term mitigations (#1657 pwritev+F_NOCACHE, #1385 kqueue backend, macOS sendfile arm) by inferred payoff per unit of effort.
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Summary
crates/fast_io/with file:LINE, derives the inferred per-file syscall budget on each platform, and identifies which io_uring features have no macOS analogue (registered buffers, SQPOLL, batched submission, link chains).docs/design/iocp-transfer-pipeline-wiring.md(PR docs(design): IOCP transfer-pipeline wiring #3698, Ensure release flow builds distributable artifacts #1868) anddocs/design/macos-kqueue-fast-io.md(PR docs(design): add macOS kqueue fast-I/O backend design (#1385) #3701, Adjust CI coverage gate and extend cross-platform builds #1385); ranks near-term mitigations (Fix IPv6 zone identifier parsing in module list requests #1657 pwritev+F_NOCACHE, Adjust CI coverage gate and extend cross-platform builds #1385 kqueue, macOS sendfile arm) by payoff vs effort.Test plan