linux-kernel - Re: [PATCH v4 1/2] mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE

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Date:   Fri, 1 Apr 2022 11:19:36 +1300
From:   Barry Song <21cnbao@...il.com>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        "Bodeddula, Balasubramaniam" <bodeddub@...zon.com>,
        Oscar Salvador <osalvador@...e.de>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>, james.morse@....com,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Xiongchun duan <duanxiongchun@...edance.com>,
        Fam Zheng <fam.zheng@...edance.com>,
        Muchun Song <smuchun@...il.com>
Subject: Re: [PATCH v4 1/2] mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP

On Thu, Mar 31, 2022 at 7:57 PM Muchun Song <songmuchun@...edance.com> wrote:
>
> The feature of minimizing overhead of struct page associated with each
> HugeTLB page is implemented on x86_64, however, the infrastructure of
> this feature is already there, we could easily enable it for other
> architectures.  Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other
> architectures to be easily enabled.  Just select this config if they
> want to enable this feature.
>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Muchun Song <songmuchun@...edance.com>

Review-by: Barry Song <baohua@...nel.org>

> ---
>  arch/x86/Kconfig |  1 +
>  fs/Kconfig       | 10 +++++++++-
>  2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 9f5bd41bf660..e69d42528542 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -119,6 +119,7 @@ config X86
>         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
>         select ARCH_WANTS_NO_INSTR
>         select ARCH_WANT_HUGE_PMD_SHARE
> +       select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP      if X86_64
>         select ARCH_WANT_LD_ORPHAN_WARN
>         select ARCH_WANTS_THP_SWAP              if X86_64
>         select ARCH_HAS_PARANOID_L1D_FLUSH
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 6c7dc1387beb..f6db2af33738 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -245,9 +245,17 @@ config HUGETLBFS
>  config HUGETLB_PAGE
>         def_bool HUGETLBFS
>
> +#
> +# Select this config option from the architecture Kconfig, if it is preferred
> +# to enable the feature of minimizing overhead of struct page associated with
> +# each HugeTLB page.
> +#
> +config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
> +       bool
> +
>  config HUGETLB_PAGE_FREE_VMEMMAP
>         def_bool HUGETLB_PAGE
> -       depends on X86_64
> +       depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
>         depends on SPARSEMEM_VMEMMAP
>
>  config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
> --
> 2.11.0
>