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the message says it is from >>> Sapphire Rapids, which is a successor of Ice Lake, so HITM is less >>> meaningful than if it came from a pre-IceLake system (see >>> https://lore.kernel.org/all/CAG48ez3RmV6SsVw9oyTXxQXHp3rqtKDk2qwJWo9TGvXCq7Xr-w@mail.gmail.com/). >>> >>> To me those numbers mainly look like you're accessing a lot more >>> cache-cold data. (On pre-IceLake they would indicate cacheline >>> bouncing, but I guess here they probably don't.) And that makes sense, >>> since before the patch, this path was just moving PTEs around without >>> looking at the associated pages/folios; basically more or less like a >>> memcpy() on x86-64. But after the patch, for every 8 bytes that you >>> copy, you have to load a cacheline from the vmemmap to get the page. >> Yup this is representative of what my investigation is showing. >> >> I've narrowed it down but want to wait to report until I'm sure... >> >> But yeah we're doing a _lot_ more work. >> >> I'm leaning towards disabling except for arm64 atm tbh, seems mremap is >> especially sensitive to this (I found issues with this with my abortive mremap >> anon merging stuff too, but really expected it there...) > Another approach would be to always read and write PTEs in > contpte-sized chunks here, without caring whether they're actually > contiguous or whatever, or something along those lines. The initial approach was to wrap all of this around pte_batch_hint(), effectively making the optimization only on arm64. I guess that sounds reasonable now.