[devel-6.6][madvise] Page Table Reclaim and Management Improvements · Pull Request !4620 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=18838

Here's a brief explanation of each patch subject:

1. **x86: select ARCH_SUPPORTS_PT_RECLAIM if X86_64**
   - Enables support for page table reclaim on 64-bit x86 architectures.

2. **x86: mm: free page table pages by RCU instead of semi RCU**
   - Changes the method for freeing page table pages to use full RCU (Read-Copy-Update) instead of semi-RCU, improving concurrency and performance.

3. **mm: pgtable: reclaim empty PTE page in madvise(MADV_DONTNEED)**
   - Reclaims empty Page Table Entries (PTEs) when `madvise` with `MADV_DONTNEED` is called, freeing up memory.

4. **mm: make zap_pte_range() handle full within-PMD range**
   - Modifies `zap_pte_range()` to handle the entire range within a PMD (Page Middle Directory) entry, ensuring more efficient page table management.

5. **mm: do_zap_pte_range: return any_skipped information to the caller**
   - Enhances `do_zap_pte_range()` to return information about skipped PTEs, providing better feedback to the caller.

6. **mm: zap_install_uffd_wp_if_needed: return whether uffd-wp pte has been re-installed**
   - Updates `zap_install_uffd_wp_if_needed()` to indicate whether a userfaultfd write-protect PTE has been reinstalled.

7. **mm: skip over all consecutive none ptes in do_zap_pte_range()**
   - Optimizes `do_zap_pte_range()` to skip over consecutive non-existent PTEs, improving performance.

8. **mm: introduce do_zap_pte_range()**
   - Introduces a new function `do_zap_pte_range()` for zapping (clearing) PTEs, likely to improve modularity and efficiency.

9. **mm: introduce zap_nonpresent_ptes()**
   - Adds a new function `zap_nonpresent_ptes()` to specifically handle the zapping of non-present PTEs.

10. **mm: userfaultfd: recheck dst_pmd entry in move_pages_pte()**
    - Ensures that the destination PMD entry is rechecked in `move_pages_pte()` for userfaultfd, enhancing reliability.

11. **mm: khugepaged: recheck pmd state in retract_page_tables()**
    - Rechecks the PMD state in `retract_page_tables()` for khugepaged, ensuring consistency and correctness.

12. **mm: pgtable: remove pte_offset_map_nolock()**
    - Removes the `pte_offset_map_nolock()` function, likely due to it being replaced or no longer needed.

13. **mm: multi-gen LRU: walk_pte_range() use pte_offset_map_rw_nolock()**
    - Updates `walk_pte_range()` to use `pte_offset_map_rw_nolock()` for multi-generation LRU, improving performance and safety.

14. **mm: userfaultfd: move_pages_pte() use pte_offset_map_rw_nolock()**
    - Modifies `move_pages_pte()` to use `pte_offset_map_rw_nolock()` for userfaultfd, enhancing performance and safety.

15. **mm: page_vma_mapped_walk: map_pte() use pte_offset_map_rw_nolock()**
    - Updates `map_pte()` in `page_vma_mapped_walk` to use `pte_offset_map_rw_nolock()`, improving performance and safety.

16. **mm: mremap: move_ptes() use pte_offset_map_rw_nolock()**
    - Modifies `move_ptes()` in `mremap` to use `pte_offset_map_rw_nolock()`, enhancing performance and safety.

17. **mm: copy_pte_range() use pte_offset_map_rw_nolock()**
    - Updates `copy_pte_range()` to use `pte_offset_map_rw_nolock()`, improving performance and safety.

18. **mm: khugepaged: collapse_pte_mapped_thp() use pte_offset_map_rw_nolock()**
    - Modifies `collapse_pte_mapped_thp()` in khugepaged to use `pte_offset_map_rw_nolock()`, enhancing performance and safety.

19. **mm: handle_pte_fault() use pte_offset_map_rw_nolock()**
    - Updates `handle_pte_fault()` to use `pte_offset_map_rw_nolock()`, improving performance and safety.

20. **arm: adjust_pte() use pte_offset_map_rw_nolock()**
    - Modifies `adjust_pte()` on ARM to use `pte_offset_map_rw_nolock()`, enhancing performance and safety.

21. **mm: khugepaged: __collapse_huge_page_swapin() use pte_offset_map_ro_nolock()**
    - Updates `__collapse_huge_page_swapin()` in khugepaged to use `pte_offset_map_ro_nolock()`, improving performance and safety.

22. **mm: filemap: filemap_fault_recheck_pte_none() use pte_offset_map_ro_nolock()**
    - Modifies `filemap_fault_recheck_pte_none()` to use `pte_offset_map_ro_nolock()`, enhancing performance and safety.

23. **powerpc: assert_pte_locked() use pte_offset_map_ro_nolock()**
    - Updates `assert_pte_locked()` on PowerPC to use `pte_offset_map_ro_nolock()`, improving performance and safety.

24. **mm: pgtable: introduce pte_offset_map_{ro|rw}_nolock()**
    - Introduces new functions `pte_offset_map_ro_nolock()` and `pte_offset_map_rw_nolock()` for safer and more efficient PTE mapping.

25. **filemap: replace pte_offset_map() with pte_offset_map_nolock()**
    - Replaces `pte_offset_map()` with `pte_offset_map_nolock()` in filemap, improving performance and safety.

26. **filemap: avoid unnecessary major faults in filemap_fault()**
    - Optimizes `filemap_fault()` to avoid unnecessary major page faults, improving performance.

27. **userfaultfd: handle zeropage moves by UFFDIO_MOVE**
    - Handles zero-page moves using the `UFFDIO_MOVE` ioctl in userfaultfd, enhancing functionality.

28. **selftests/mm: add UFFDIO_MOVE ioctl test**
    - Adds a test case for the `UFFDIO_MOVE` ioctl in the self-tests for the memory management subsystem.

29. **selftests/mm: add uffd_test_case_ops to allow test case-specific operations**
    - Adds a mechanism for test case-specific operations in the userfaultfd self-tests, improving test flexibility.

30. **selftests/mm: call uffd_test_ctx_clear at the end of the test**
    - Ensures that `uffd_test_ctx_clear` is called at the end of each test, cleaning up resources and preventing leaks.

31. **userfaultfd: UFFDIO_MOVE uABI**
    - Defines the user ABI (Application Binary Interface) for the `UFFDIO_MOVE` ioctl in userfaultfd, standardizing its usage.

32. **mm/rmap: support move to different root anon_vma in folio_move_anon_rmap()**
    - Adds support for moving to a different root anonymous virtual memory area (anon_vma) in `folio_move_anon_rmap()`, enhancing flexibility.

33. **docs/mm: add VMA locks documentation**
    - Adds documentation for VMA (Virtual Memory Area) locks, providing better guidance and understanding for developers.

类型	指派人员	状态
审查	hsiangkao Guanjun josephhz xunlei JeffleXu zhongjiang Artie Ding vxuyu zelindeng baolin.wang Xuchun Shang	已完成 (0/0人)
测试	小龙已测试通过	已完成 (1/1人)

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