linux-kernel - Re: [PATCH v2 2/2] arm64: hugetlb: enable __HAVE_ARCH_FLUSH_HUGETLB_TLB

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Date:   Tue, 1 Aug 2023 10:31:59 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mina Almasry <almasrymina@...gle.com>, kirill@...temov.name,
        joel@...lfernandes.org,
        William Kucharski <william.kucharski@...cle.com>,
        kaleshsingh@...gle.com, Linux-MM <linux-mm@...ck.org>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>, 21cnbao@...il.com
Subject: Re: [PATCH v2 2/2] arm64: hugetlb: enable
 __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE



> On Aug 1, 2023, at 10:31, Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
> 
> It is better to use huge page size instead of PAGE_SIZE
> for stride when flush hugepage, which reduces the loop
> in __flush_tlb_range().
> 
> Let's support arch's flush_hugetlb_tlb_range(), which is
> used in hugetlb_unshare_all_pmds(), move_hugetlb_page_tables()
> and hugetlb_change_protection() for now.
> 
> Note, for hugepages based on contiguous bit, it has to be
> invalidated individually since the contiguous PTE bit is
> just a hint, the hardware may or may not take it into account.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>