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Direct host file I/O in the userland broker on Linux - #1681
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On Linux, LocalFs reads and writes a buffer that is one contiguous part of raw bytes directly with one pread or pwrite, falling back to the bounce buffer for other buffers. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 4e8b6cad-28c2-46d9-aef5-95cf4a401fb7
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🤖 SemverChecks 🤖 No breaking API changes detected Note: this does not mean API is unchanged, or even that there are no breaking changes; simply, none of the detections triggered. |
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This PR lets the userland broker on Linux read and write host files directly in the runner's shared memory. When a request's buffer is one contiguous run of raw bytes,
LocalFstransfers it with a singlepread/pwriteinstead of staging it through a bounce buffer. Fragmented buffers, buffers without raw memory, and other hosts keep the bounce buffer, since vectored I/O would split writes to files such as procfs entries.