[PATCH -v4 0/2] arm, tlbflush: avoid TLBI broadcast if page reused in write fault

Huang Ying
2025-11-04T09:56:00Z

This series is to optimize the system performance via avoiding TLBI
broadcast if page is reused in the write protect fault handler. More
details of the background and the test results can be found in [2/2].

Changelog:

v4:

- Collected Reviewed-by and Acked-by, Thanks Lorenzo, David, Ryan, and
Barry.

v3:

- Various code cleanup and improved design and document in [1/2],
Thanks Lorenzo and David's comments!
- Fixed a typo and improved function interface in [2/2], Thanks Ryan's
comments!

v2:

- Various code cleanup in [1/2], Thanks David's comments!
- Remove unnecessary __local_flush_tlb_page_nosync() in [2/2], Thanks Ryan's comments!
- Add missing contpte processing, Thanks Rayn and Catalin's comments!

Huang Ying (2):
mm: add spurious fault fixing support for huge pmd
arm64, tlbflush: don't TLBI broadcast if page reused in write fault

arch/arm64/include/asm/pgtable.h | 14 ++++---
arch/arm64/include/asm/tlbflush.h | 56 ++++++++++++++++++++++++++++
arch/arm64/mm/contpte.c | 3 +-
arch/arm64/mm/fault.c | 2 +-
include/linux/huge_mm.h | 2 +-
include/linux/pgtable.h | 4 ++
mm/huge_memory.c | 33 ++++++++++------
mm/internal.h | 2 +-
mm/memory.c | 62 +++++++++++++++++++++++--------
9 files changed, 140 insertions(+), 38 deletions(-)

Best Regards,
Huang, Ying