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

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Message-ID: <87ms509dpg.fsf@DESKTOP-5N7EMDA>
Date: Thu, 06 Nov 2025 09:01:15 +0800
From: "Huang, Ying" <ying.huang@...ux.alibaba.com>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>,  Andrew Morton
 <akpm@...ux-foundation.org>,  David Hildenbrand <david@...hat.com>,
  Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,  Vlastimil Babka
 <vbabka@...e.cz>,  Zi Yan <ziy@...dia.com>,  Baolin Wang
 <baolin.wang@...ux.alibaba.com>,  Ryan Roberts <ryan.roberts@....com>,
  Yang Shi <yang@...amperecomputing.com>,  "Christoph Lameter (Ampere)"
 <cl@...two.org>,  Dev Jain <dev.jain@....com>,  Barry Song
 <baohua@...nel.org>,  Anshuman Khandual <anshuman.khandual@....com>,
  Kefeng Wang <wangkefeng.wang@...wei.com>,  Kevin Brodsky
 <kevin.brodsky@....com>,  Yin Fengwei <fengwei_yin@...ux.alibaba.com>,
  linux-arm-kernel@...ts.infradead.org,  linux-kernel@...r.kernel.org,
  linux-mm@...ck.org
Subject: Re: [PATCH -v4 0/2] arm, tlbflush: avoid TLBI broadcast if page
 reused in write fault

Huang Ying <ying.huang@...ux.alibaba.com> writes:

> 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(-)

Hi, Catalin,

Do you have time to take a look at this series?  Are there some remain
issues?

---
Best Regards,
Huang, Ying