linux-kernel - Re: [PATCH V3 4/5] arm64/mm: Enable HugeTLB migration

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Message-ID: <20181108103545.c634kha6kpgpy34q@capper-debian.cambridge.arm.com>
Date:   Thu, 8 Nov 2018 10:35:57 +0000
From:   Steve Capper <Steve.Capper@....com>
To:     Anshuman Khandual <Anshuman.Khandual@....com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Punit Agrawal <Punit.Agrawal@....com>,
        Will Deacon <Will.Deacon@....com>,
        Steven Price <Steven.Price@....com>,
        Catalin Marinas <Catalin.Marinas@....com>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "n-horiguchi@...jp.nec.com" <n-horiguchi@...jp.nec.com>,
        nd <nd@....com>
Subject: Re: [PATCH V3 4/5] arm64/mm: Enable HugeTLB migration

On Tue, Oct 23, 2018 at 06:32:00PM +0530, Anshuman Khandual wrote:
> Let arm64 subscribe to generic HugeTLB page migration framework. Right now
> this only works on the following PMD and PUD level HugeTLB page sizes with
> various kernel base page size combinations.
> 
>        CONT PTE    PMD    CONT PMD    PUD
>        --------    ---    --------    ---
> 4K:         NA     2M         NA      1G
> 16K:        NA    32M         NA
> 64K:        NA   512M         NA
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>


Reviewed-by: Steve Capper <steve.capper@....com>

> ---
>  arch/arm64/Kconfig | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index a8ae30f..4b3e269 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1331,6 +1331,10 @@ config SYSVIPC_COMPAT
>  	def_bool y
>  	depends on COMPAT && SYSVIPC
>  
> +config ARCH_ENABLE_HUGEPAGE_MIGRATION
> +	def_bool y
> +	depends on HUGETLB_PAGE && MIGRATION
> +
>  menu "Power management options"
>  
>  source "kernel/power/Kconfig"
> -- 
> 2.7.4
>