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 vMrIJ//D 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Anyhow, this pretty much sounds like > noise and can be ignored. > It's not about hugetlb. It looks like related with the change: diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 888353c209c03..7577fe7debafc 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -1095,7 +1095,12 @@ PAGEFLAG(Isolated, isolated, PF_ANY); static __always_inline int PageAnonExclusive(const struct page *page) { VM_BUG_ON_PGFLAGS(!PageAnon(page), page); - VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page); + /* + * HugeTLB stores this information on the head page; THP keeps it per + * page + */ + if (PageHuge(page)) + page = compound_head(page); return test_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags); The PageAnonExclusive() function is changed. And the profiling data showed it: 0.00 +3.9 3.90 perf-profile.calltrace.cycles-pp.folio_try_dup_anon_rmap_ptes.copy_present_ptes.copy_pte_range.copy_p4d_range.copy_page_range According https://download.01.org/0day-ci/archive/20240730/202407301049.5051dc19-oliver.sang@intel.com/config-6.9.0-rc4-00197-gc0bff412e67b: # CONFIG_DEBUG_VM is not set So maybe such code change could bring difference? And yes. 2.9% regression can be in noise range. Thanks. Regards Yin, Fengwei