linux-kernel - Re: [PATCH v11 3/4] mm/tlbbatch: Introduce arch_flush_tlb_batched

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Message-ID: <ZLrNYtekYsMFZuVK@arm.com>
Date:   Fri, 21 Jul 2023 19:24:34 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Yicong Yang <yangyicong@...wei.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        mark.rutland@....com, ryan.roberts@....com, will@...nel.org,
        anshuman.khandual@....com, linux-doc@...r.kernel.org,
        corbet@....net, peterz@...radead.org, arnd@...db.de,
        punit.agrawal@...edance.com, linux-kernel@...r.kernel.org,
        darren@...amperecomputing.com, yangyicong@...ilicon.com,
        huzhanyuan@...o.com, lipeifeng@...o.com, zhangshiming@...o.com,
        guojian@...o.com, realmz6@...il.com, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        Barry Song <21cnbao@...il.com>, wangkefeng.wang@...wei.com,
        xhao@...ux.alibaba.com, prime.zeng@...ilicon.com,
        Jonathan.Cameron@...wei.com
Subject: Re: [PATCH v11 3/4] mm/tlbbatch: Introduce
 arch_flush_tlb_batched_pending()

On Mon, Jul 17, 2023 at 09:10:03PM +0800, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@...ilicon.com>
> 
> Currently we'll flush the mm in flush_tlb_batched_pending() to
> avoid race between reclaim unmaps pages by batched TLB flush
> and mprotect/munmap/etc. Other architectures like arm64 may
> only need a synchronization barrier(dsb) here rather than
> a full mm flush. So add arch_flush_tlb_batched_pending() to
> allow an arch-specific implementation here. This intends no
> functional changes on x86 since still a full mm flush for
> x86.
> 
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>