On October 12, Michael Larabel reported in Phoronix that he had spotted an experimental branch in Linus Torvalds’ Linux repository the previous day. Named noref-filemap-read-with-llm, it aims to avoid folio references when reading from the page cache—a change aimed at contention during small reads of one file by multiple threads. In the patch message quoted by Phoronix, Torvalds said Claude Code assisted with the code, test programs, review and first draft of the cover letter under his direction.
The branch targets contention in page-cache reads
The page cache holds data from files in memory so the kernel can serve reads without fetching that data from storage each time. A folio is a unit the kernel uses to manage pages; its reference count tracks references to it. The reported branch aims to read cached file data without taking those folio references, targeting a workload in which multiple threads make small reads from one file and contend over reference counting.
What Claude Code did—and who ran the measurements
Torvalds’ account, quoted in the Phoronix report, credits Claude Code with assistance on four parts of the work: code, test programs, review and an initial cover-letter draft. Torvalds said he directed that work and ran the measurements on his own machine.
That division matters: the reported use was assistance under Torvalds’ direction, and Torvalds—not the coding assistant—ran the measurements.
What the performance chart compares
Phoronix’s chart compares “Base” and “Series” in reads per second, measured in millions, across three configurations: one thread, eight threads, and four threads with one thread per core. The Series bar is higher than Base in all three, with the largest visible gap at eight threads.
The chart gives a directional comparison for those configurations. It does not supply a numerical speedup to apply to other workloads or systems.
Torvalds’ earlier comments on AI and maintenance
In a separate conversation shared by SavvyNik in a video published June 18, 2026, Torvalds discussed AI tools and the work of maintaining software. He described low-quality, drive-by AI bug reports as a burden for maintainers of small projects and emphasized that developers need to understand software they intend to maintain.
Phoronix’s October 12 report left open whether Torvalds would merge the patches during the Linux 7.4 merge window.
