linux-kernel - Re: [PATCH 2/4] arm64/hugetlb: Implement arm64 specific hugetlb_mask_last

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Date:   Fri, 17 Jun 2022 16:26:23 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Michal Hocko <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        James Houghton <jthoughton@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        catalin.marinas@....com, will@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] arm64/hugetlb: Implement arm64 specific
 hugetlb_mask_last_page

On Thu, Jun 16, 2022 at 02:05:16PM -0700, Mike Kravetz wrote:
> From: Baolin Wang <baolin.wang@...ux.alibaba.com>
> 
> The HugeTLB address ranges are linearly scanned during fork, unmap and
> remap operations, and the linear scan can skip to the end of range mapped
> by the page table page if hitting a non-present entry, which can help
> to speed linear scanning of the HugeTLB address ranges.
> 
> So hugetlb_mask_last_page() is introduced to help to update the address in
> the loop of HugeTLB linear scanning with getting the last huge page mapped
> by the associated page table page[1], when a non-present entry is encountered.
> 
> Considering ARM64 specific cont-pte/pmd size HugeTLB, this patch implemented
> an ARM64 specific hugetlb_mask_last_page() to help this case.
> 
> [1] https://lore.kernel.org/linux-mm/20220527225849.284839-1-mike.kravetz@oracle.com/
> 
> Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>

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

Thanks.