[PATCH mm-new v2 0/2] mm/khugepaged: optimize collapse candidate detection

[Lance Yang <lance.yang@linux.dev>]

Hi all,

This series improves the THP scanner by teaching it to detect unsuitable
collapse candidates, such as guard PTEs, earlier in the scan to avoid
wasted work.

Thanks,
Lance

---
v1 -> v2:
 - #01 Dropped patch that skipped mlocked VMAs from THP collapse, per
       discussion. Thanks a lot to Hugh, Kiryl, Lorenzo, Dev and Mika!
 - #02 Pick RB from Lorenzo - thanks!
       Update the changelog (per Lorenzo)
       Pick AB from David - thanks!
 - #03 Reuse SCAN_PTE_NON_PRESENT for guard PTEs (per Lorenzo)
 - https://lore.kernel.org/linux-mm/20250914143547.27687-1-lance.yang@linux.dev

Lance Yang (2):
  mm: make is_guard_pte_marker() available for hugepage collapse
  mm/khugepaged: abort collapse scan on guard PTEs

 include/linux/swapops.h |  6 ++++++
 mm/khugepaged.c         | 10 ++++++++++
 mm/madvise.c            |  6 ------
 3 files changed, 16 insertions(+), 6 deletions(-)

-- 
2.49.0