On Fri, May 08, 2026 at 10:32:20AM -0700, Andrew Morton wrote: > On Fri, 8 May 2026 16:55:12 +0100 "Kiryl Shutsemau (Meta)" <[email protected]> > wrote: > > > This series adds userfaultfd support for tracking the working set of > > VM guest memory, so a VMM can identify cold pages and evict them to > > tiered or remote storage. > > > > v1: https://lore.kernel.org/all/[email protected]/ > > Thanks. I'll duck v2 for now, await more review.
Sure. > > Assisted-by: Claude:claude-opus-4-6 > > For my education, and perhaps for others: can you please explain how > you used Claude in the preparation of this series? I'm no expert by any means, but here's how I used it here. For this particular project there was quite a bit of path-finding. I had a phase where I bounced ideas off Claude. It helped me understand the problem space better and formulate possible solutions. Rubber ducking on steroids. Once it's clear _what_ to do, we formulate a plan on _how_. It also involves back and forth. Once the plan was done, I gave the go-ahead on executing it. Userfaultfd already had a test suite, and it was extended to cover the new functionality. I have some scripts to build the kernel and run it in a VM. Claude knows how to use them, so at the end of plan execution I had a functional feature. Then the review phase. The most time-consuming and draining part. I carefully reviewed all patches. At this stage I use Claude as an editor. Some of the changes I asked for required substantial rework of the whole patchset, and I had to start the review from scratch. A good test suite and build-test harness help to keep the whole thing from falling apart. It took me quite a few review rounds before I was happy with the result. Maybe between 8 and 10. I think better instructions can cut this number down. And I need to rethink how I do the review. Reading the git log in parallel with examining the code in the editor and giving instructions to Claude is not very ergonomic. There's room for improvement. Once I was happy with the patchset to give it Signed-off-by, I ran it through Chris' review prompts several times, addressing the issues. I hope it is helpful. I would also be glad if other folks shared their workflow. There is probably a better way to achieve the same result. I am new to the game. -- Kiryl Shutsemau / Kirill A. Shutemov
