{"id":61535,"date":"2026-10-13T17:30:46","date_gmt":"2026-10-13T17:30:46","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/linus-torvalds-is-using-ai-to-develop-linux-kernel-code-now\/"},"modified":"2026-10-13T17:30:46","modified_gmt":"2026-10-13T17:30:46","slug":"linus-torvalds-is-using-ai-to-develop-linux-kernel-code-now","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/linus-torvalds-is-using-ai-to-develop-linux-kernel-code-now\/","title":{"rendered":"Linus Torvalds is using AI to develop Linux kernel code now"},"content":{"rendered":"<h3 class=\"wp-block-heading\">ZDNET\u2019s key takeaways<\/h3>\n<ul class=\"wp-block-list\">\n<li>Torvalds just released a set of patches, which were largely written with Anthropic\u2019s Claude Code.<\/li>\n<li>These new patches address an unsolved memory cache slowdown problem when using multiple cores and processors.<\/li>\n<li>Linus Torvalds had been moving closer to favoring AI, and this was the final step toward embracing it for Linux development.<\/li>\n<\/ul>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n<p>It had to happen. Linus Torvalds announced to the world that he used AI to write code for the Linux kernel. Who\u2019d thought it? Well, me for one. Over the last few years, I\u2019ve seen Torvalds\u2019 attitude change from skeptical to seeing AI as a useful tool for programmers and maintainers.&nbsp;<\/p>\n<p>In his <a href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?h=noref-filemap-read-with-llm\" target=\"_blank\" rel=\"noopener\">Git submission<\/a>, he wrote, \u201cThe code, the test programs, the review behind the list above and the first draft of this text were done with an LLM coding assistant (Claude Code) under my direction.\u201d<\/p>\n<p><strong>Also: <a href=\"https:\/\/www.zdnet.com\/tech\/linus-torvalds-ai-coding-programming\/\">\u2018I use AI to do the things that I\u2019m bad at\u2019: Linus Torvalds on why it works for him<\/a><\/strong><\/p>\n<div class=\"wp-block-ziff-davis-exco-video is-injected\" id=\"exco-video-block-6a8e06fe4d2cfb09fd68fb54-1365618-4\" data-exco-video-id data-exco-playlist-id=\"6a8e06fe4d2cfb09fd68fb54\" data-exco-video-title data-exco-video-src data-exco-video-duration=\"0\" data-exco-video-poster data-exco-suppress-ads=\"0\" data-exco-autoplay=\"0\" data-exco-sticky=\"1\">\n<p class=\"exco-video__eyebrow\">More from ZDNET<\/p>\n<\/p><\/div>\n<h2 class=\"wp-block-heading\">Tackling a shared-memory bottleneck<\/h2>\n<p>Specifically, the fix addresses contention in Linux\u2019s page cache, which holds file data in memory. When several threads repeatedly read small amounts of data from the same cached file, they take and release references to the folio backing that data. Those reference-count updates require atomic writes to a shared cache line. This in turn forces processor cores to compete over it.<\/p>\n<p>Doesn\u2019t sound like that big a problem, does it? Wrong. In some workloads, it can really slow things down. Torvalds found that when eight threads issued 16-byte pread() calls against the same page on a four-core, eight-thread Intel Core i7-8565U laptop, the shared cache line accounted for 99.92% of the measured cross-core load, according to <a href=\"https:\/\/community.intel.com\/t5\/Software-Tuning-Performance\/Last-Level-Cache-Hits-Misses\/td-p\/1112959\" target=\"_blank\" rel=\"noopener\">Hit in Modified cache line (HITMs)<\/a>. That slows work down considerably.&nbsp;<\/p>\n<p>This isn\u2019t just Linus scratching a personal itch. It\u2019s been a known issue since 2024. Earlier attempts to fix it, though, have come to naught.&nbsp;<\/p>\n<p>Torvalds and Claude Code\u2019s proposed patches change when the kernel can reuse memory removed from the page cache. Rather than returning that memory to the allocator immediately, the patches defer reuse until a read-copy-update (RCU) grace period has elapsed. That lets a reader protected by an RCU read-side section copy data directly into a user buffer without taking a folio reference.<\/p>\n<p><strong>Also: <a href=\"https:\/\/www.zdnet.com\/tech\/free-photoshop-clone-alternative-linux-photocraft\/\">Someone made a free Photoshop clone \u2013 so I had to try it on Linux<\/a><\/strong><\/p>\n<p>This approach trades immediate memory reclamation for a read path that avoids repeatedly updating a shared reference counter. The reported performance gains are substantial within that specific test. Eight-thread throughput rose from approximately 9.9\u201310.4 million reads per second to 30\u201333 million, while kernel cycles per read fell from roughly 2,950 to 725. Single-thread reads improved more modestly, from about 452\u2013454 cycles to 408\u2013409 cycles per read. Torvalds added in his pull request (PR) that&nbsp;\u201cA machine with more CPUs, or more than one socket, should gain more; nothing bigger has been measured.\u201d<\/p>\n<p>This doesn\u2019t mean Linux as a whole runs three times faster. Hardly! Instead, this describes experimenta<strong>l r<\/strong>esults from a particular small-read workload on Torvald\u2019s personal laptop, which he had with him in Prague at <a href=\"https:\/\/lpc.events\/\" target=\"_blank\" rel=\"noopener\">Linux Plumbers<\/a>.&nbsp;<\/p>\n<h2 class=\"wp-block-heading\">Faster reads, unfinished memory management<\/h2>\n<p>That\u2019s not to say Torvalds and Claude Code have fixed this issue. We\u2019re far from being able to say that. The performance gains come with engineering trade-offs. Delaying memory reuse means pages can remain unavailable while the kernel waits for an RCU grace period. In his Git submission, Torvalds described that reclamation issue as \u201cthe part of this series that is least solved.\u201d<\/p>\n<p><strong>Also: <a href=\"https:\/\/www.zdnet.com\/tech\/ubuntu-26-10-canonical-release-open-source\/\">I\u2019ve used Ubuntu for 22 years \u2013 and 26.10 might be its best release yet<\/a><\/strong><\/p>\n<p>There is also a regression when a read targets a user page that is not yet mapped. The new path incurs an additional failed exception before falling back to the existing implementation. As of Oct. 13th, the branch remained outside the mainline&nbsp;Linux 7.3-rc6. Whether it will ever be merged, and on what timetable, remains up in the air.<\/p>\n<h3 class=\"wp-block-heading\">From AI skepticism to hands-on use<\/h3>\n<p>Torvalds\u2019s decision to use Claude Code reflects a long-term evolution in his attitude toward AI. This hasn\u2019t been a simple reversal from opposition to support.<\/p>\n<p>In December 2023, he <a href=\"https:\/\/www.zdnet.com\/article\/linus-torvalds-on-state-of-linux-today-and-how-ai-figures-in-its-future\/\">described<\/a> AI as a potential aid to developers, saying, \u201cI see AI as a tool that can help us be better at what we do.\u201d At the time, his interest in AI was around how it could help identify bugs, rather than writing code. No one was giving serious thought to using AI to write serious programs (hard to believe now).<\/p>\n<p>By late 2025, Torvalds <a href=\"https:\/\/www.zdnet.com\/article\/linus-torvalds-ai-tool-maintaining-linux-code\/\">was calling himself<\/a> \u201ca huge believer in AI as a tool, and saying he was more interested not just in finding bugs, but in maintaining code and reviewing patches. Generating new, serious code for Linux was still largely off the table. Still, in January 2026, he began <a href=\"https:\/\/www.zdnet.com\/article\/linus-torvalds-vibe-coding-ai\/\">toying with AI-assisted coding<\/a> for a Python audio visualizer in a hobby project.<\/p>\n<p><strong>Also: <a href=\"https:\/\/www.zdnet.com\/article\/why-most-developers-prefer-claude-code-over-codex\/\">75% of developers I surveyed prefer Claude Code \u2013 here\u2019s why they choose it over Codex<\/a><\/strong><\/p>\n<p>His latest remarks, <a href=\"https:\/\/www.zdnet.com\/tech\/linus-torvalds-ai-coding-programming\/\">reported Oct. 9<\/a> following a conversation with Dirk Hohndel at <a href=\"https:\/\/events.linuxfoundation.org\/open-source-summit-europe\/\" target=\"_blank\" rel=\"noopener\">Open Source Summit Europe<\/a> in Prague, were more enthusiastic. <\/p>\n<p>\u201cI used to think it was just not very good \u2014 but now I\u2019m at the point where I actually really like using AI,\u201d Torvalds said. \u201cI think AI is a wonderful tool if you use it correctly and treat it as a tool, and I find it makes programming much more enjoyable.\u201d <\/p>\n<p>Even so, he cautioned, \u201cI think that you need to be very careful using AI when you\u2019re doing something real and important.\u201d It doesn\u2019t get much less real and important than Linux.&nbsp;<\/p>\n<p>The page-cache experiment puts both sides of his position on display. Claude Code helped produce kernel code, tests, and review materials. The resulting branch shows promising benchmark gains, but also the unresolved memory-reclamation questions and performance regression that must be addressed before the experiment can become production kernel code.&nbsp;<\/p>\n<p>Still, we\u2019ve reached a turning point. Torvalds, arguably the world\u2019s foremost developer and maintainer, is now using AI to develop new Linux kernel code. This would have been unthinkable even a year ago, and even now some people still struggle to imagine AI adding new code to Linux or any other important program.&nbsp;<\/p>\n<section class=\"zd-disqus\" data-zd-disqus data-disqus-shortname=\"zdnet-1\" data-disqus-identifier=\"1365618\" data-disqus-url=\"https:\/\/www.zdnet.com\/innovation\/linus-torvalds-uses-ai-to-write-linux-kernel-patch\/\" data-disqus-title=\"Linus Torvalds is using AI to develop Linux kernel code now\" data-disqus-api-key=\"y0Dp0T6itn9rbTvSf2xkzkhaUL7c5EJsmaWF3XYBqXNz8GHH7wSX1nXi4qzdihWV\" data-disqus-show-label=\"Show Comments\" data-disqus-hide-label=\"Hide Comments\"> <button type=\"button\" class=\"zd-disqus__toggle\" data-zd-disqus-toggle aria-expanded=\"false\"> <span class=\"zd-disqus__toggle-text\" data-zd-disqus-label>Show Comments<\/span> <svg class=\"zd-disqus__toggle-icon\" width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" aria-hidden=\"true\" focusable=\"false\"> <path d=\"M7 1 V12.5 M2.5 8 L7 12.5 L11.5 8\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" \/> <\/svg> <\/button> <\/p>\n<div class=\"zd-disqus__panel\" data-zd-disqus-panel hidden>\n<p class=\"zd-disqus__consent\" data-zd-disqus-consent hidden>Please accept cookies to view the comments powered by Disqus.<\/p>\n<\/p><\/div>\n<p> <noscript>Please enable JavaScript to view the comments powered by Disqus.<\/noscript> <\/section>\n<div class=\"articleAuthorBioFooter-container\">\n<div class=\"articleAuthorBioFooter\">\n<div class=\"articleAuthorBioFooter_body\">\n<div class=\"articleAuthorBioFooter_nameBlock\">\n<div class=\"c-cmsImage articleAuthorBioFooter_image\"> <picture class=\"c-cmsImage_image\"> <img alt=\"Steven Vaughan-Nichols\" src=\"https:\/\/www.zdnet.com\/wp-content\/uploads\/sites\/3\/steven-vaughan-nichols.jpg?w=64\" srcset=\"https:\/\/www.zdnet.com\/wp-content\/uploads\/sites\/3\/steven-vaughan-nichols.jpg?w=128 2x\" class=\"avatar avatar-64 photo\" height=\"64\" width=\"64\" loading=\"lazy\" decoding=\"async\"> <\/picture> <\/div>\n<div class=\"articleAuthorBioFooter_nameText\">\n<div class=\"articleAuthorBioFooter_name\"> <span>Steven Vaughan-Nichols<\/span> <\/div>\n<p> <span class=\"articleAuthorBioFooter_credentials\"> Senior Contributing Editor <\/span> <\/div>\n<\/p><\/div>\n<p> <span class=\"articleAuthorBioFooter_bio has-bio\"> <span>Steven J. Vaughan-Nichols is a freelance writer and technology analyst. Besides ZDNET, he works with Foundry (Formerly IDG Communications), The Register, The New Stack, TechStrong, and Cathey Communications. He does not own stocks or other investments in any technology company.<\/span> <a href=\"https:\/\/www.zdnet.com\/meet-the-team\/sjvn\/\" rel=\"author\" class=\"articleAuthorBioFooter_link\"> See full bio <\/a> <\/span> <\/div>\n<p> <!-- Latest Articles Section --> <\/p>\n<div class=\"articleAuthorBioFooter_latest\">\n<h3 class=\"articleAuthorBioFooter_latestTitle\"> The Latest from Steven <\/h3>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p><!-- .articleAuthorBioFooter-container --><br \/>\nREAD MORE <a href=\"https:\/\/www.zdnet.com\/innovation\/linus-torvalds-uses-ai-to-write-linux-kernel-patch\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The move is a turning point in the developer\u2019s relationship with AI and Linux. READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":61536,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-61535","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linus Torvalds is using AI to develop Linux kernel code now 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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