linux-kernel - Re: [PATCH rfc -next 00/10] mm: convert to generic VMA lock-based page fault

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Date:   Thu, 13 Jul 2023 19:46:40 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
        <surenb@...gle.com>
CC:     Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <loongarch@...ts.linux.dev>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-riscv@...ts.infradead.org>,
        <linux-s390@...r.kernel.org>
Subject: Re: [PATCH rfc -next 00/10] mm: convert to generic VMA lock-based
 page fault

Please ignore this one...

On 2023/7/13 17:51, Kefeng Wang wrote:
> Add a generic VMA lock-based page fault handler in mm core, and convert
> architectures to use it, which eliminate architectures's duplicated codes.
> 
> With it, we can avoid multiple changes in architectures's code if we
> add new feature or bugfix.
> 
> This fixes riscv missing change about commit 38b3aec8e8d2 "mm: drop per-VMA
> lock when returning VM_FAULT_RETRY or VM_FAULT_COMPLETED", and in the end,
> we enable this feature on ARM32/Loongarch too.
> 
> This is based on next-20230713, only built test(no loongarch compiler,
> so except loongarch).
> 
> Kefeng Wang (10):
>    mm: add a generic VMA lock-based page fault handler
>    x86: mm: use try_vma_locked_page_fault()
>    arm64: mm: use try_vma_locked_page_fault()
>    s390: mm: use try_vma_locked_page_fault()
>    powerpc: mm: use try_vma_locked_page_fault()
>    riscv: mm: use try_vma_locked_page_fault()
>    ARM: mm: try VMA lock-based page fault handling first
>    loongarch: mm: cleanup __do_page_fault()
>    loongarch: mm: add access_error() helper
>    loongarch: mm: try VMA lock-based page fault handling first
> 
>   arch/arm/Kconfig          |  1 +
>   arch/arm/mm/fault.c       | 15 ++++++-
>   arch/arm64/mm/fault.c     | 28 +++---------
>   arch/loongarch/Kconfig    |  1 +
>   arch/loongarch/mm/fault.c | 92 ++++++++++++++++++++++++---------------
>   arch/powerpc/mm/fault.c   | 54 ++++++++++-------------
>   arch/riscv/mm/fault.c     | 38 +++++++---------
>   arch/s390/mm/fault.c      | 23 +++-------
>   arch/x86/mm/fault.c       | 39 +++++++----------
>   include/linux/mm.h        | 28 ++++++++++++
>   mm/memory.c               | 42 ++++++++++++++++++
>   11 files changed, 206 insertions(+), 155 deletions(-)
>