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 khJex9eW 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Hildenbrand wrote: >> On 24.07.25 11:12, David Hildenbrand wrote: >>> On 24.07.25 11:09, Huan Yang wrote: >>>> >>>> 在 2025/7/24 16:59, David Hildenbrand 写道: >>>>> On 24.07.25 10:44, Huan Yang wrote: >>>>>> Summary >>>>>> == >>>>>> This patchset reuses page_type to store migrate entry count >>>>>> during the >>>>>> period from migrate entry setup to removal, enabling accelerated VMA >>>>>> traversal when removing migrate entries, following a similar >>>>>> principle to >>>>>> early termination when folio is unmapped in try_to_migrate. >>>>> >>>>> I absolutely detest (ab)using page types for that, so no from my side >>>>> unless I am missing something important. >>>>> >>>>>> >>>>>> In my self-constructed test scenario, the migration time can be >>>>>> reduced >>>>> >>>>> How relevant is that in practice? >>>> >>>> IMO, any folio mapped < nr vma in mapping(anon_vma, addresss_space), >>>> will benefit from this. >>>> >>>> So, all pages that have been COW-ed by child processes can be skipped. >>> >>> For small anon folios, you could use the anon-exclusive marker to >>> derive >>> "there can only be a single mapping". >>> >>> It's stored alongside the migration entry. >>> >>> So once you restored that single migration entry, you can just stop the >>> walk. >> >> Essentially, something (untested) like this: >> >> diff --git a/mm/migrate.c b/mm/migrate.c >> index 425401b2d4e14..aa5bf96b1daee 100644 >> --- a/mm/migrate.c >> +++ b/mm/migrate.c >> @@ -421,6 +421,15 @@ static bool remove_migration_pte(struct folio >> *folio, >>                      /* No need to invalidate - it was non-present >> before */ >>                   update_mmu_cache(vma, pvmw.address, pvmw.pte); >> + >> +               /* >> +                * If the small anon folio is exclusive, here can be >> exactly one >> +                * page mapping -- the one we just restored. >> +                */ >> +               if (!folio_test_large(folio) && (rmap_flags & >> RMAP_EXCLUSIVE)) { >> +                       page_vma_mapped_walk_done(&pvmw); >> +                       break; >> +               } >>           } >>              return true; > > Probably that won't really help I assume, because __folio_set_anon() > will move the new anon folio under vma->anon_vma, not > vma->anon_vma->root. > > So I assume you mean that we had a COW-shared folio now mapped only > into some VMAs (some mappings in other processes removed due to CoW or > similar). > > In that case aborting early can help. > > Not in all cases though, just imagine that the very last VMA we're > iterating maps the page. You have to iterate through all of them > either way ... no way around that, really. Indeed, whether we can exit the loop early depends on the position of the terminating VMA in the tree. I think a better approach would be to remove the fully COW-ed VMAs and their associated AVCs from the anon_vma's tree. I've been researching this aspect, but haven't made any progress yet.(I have some ideas, but the specific implementation is still challenging.)