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No issues were observed with mm-selftests, build >>>> tested on x86_64. >>> um what.  Seems to claim that "selftests still compiles after I messed >>> with stuff", which isn't very impressive ;)  Please clarify? >> Sorry I mean to say that the mm-selftests pass. > I think you're saying you both compiled and ran the mm selftests for arm64. And > additionally you compiled for x86_64? (Just trying to help clarify). Yes, ran mm-selftests on arm64, and build-tested the patches for x86. > >>>> We use the following test cases to measure performance, mprotect()'ing >>>> the mapped memory to read-only then read-write 40 times: >>>> >>>> Test case 1: Mapping 1G of memory, touching it to get PMD-THPs, then >>>> pte-mapping those THPs >>>> Test case 2: Mapping 1G of memory with 64K mTHPs >>>> Test case 3: Mapping 1G of memory with 4K pages >>>> >>>> Average execution time on arm64, Apple M3: >>>> Before the patchset: >>>> T1: 7.9 seconds   T2: 7.9 seconds   T3: 4.2 seconds >>>> >>>> After the patchset: >>>> T1: 2.1 seconds   T2: 2.2 seconds   T3: 4.3 seconds >>> Well that's tasty. >>> >>>> Observing T1/T2 and T3 before the patchset, we also remove the regression >>>> introduced by ptep_get() on a contpte block. And, for large folios we get >>>> an almost 74% performance improvement, albeit the trade-off being a slight >>>> degradation in the small folio case. >>>> >