linux-kernel - Re: [PATCH v4 04/11] mm: thp: introduce CONFIG_ARCH_ENABLE_THP

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Message-ID: <20170324141037.2eyovzq2bmcdmwzu@node.shutemov.name>
Date:   Fri, 24 Mar 2017 17:10:37 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Zi Yan <zi.yan@...t.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kirill.shutemov@...ux.intel.com, akpm@...ux-foundation.org,
        minchan@...nel.org, vbabka@...e.cz, mgorman@...hsingularity.net,
        mhocko@...nel.org, n-horiguchi@...jp.nec.com,
        khandual@...ux.vnet.ibm.com, zi.yan@...rutgers.edu,
        dnellans@...dia.com
Subject: Re: [PATCH v4 04/11] mm: thp: introduce
 CONFIG_ARCH_ENABLE_THP_MIGRATION

On Mon, Mar 13, 2017 at 11:45:00AM -0400, Zi Yan wrote:
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> 
> Introduces CONFIG_ARCH_ENABLE_THP_MIGRATION to limit thp migration
> functionality to x86_64, which should be safer at the first step.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
> v1 -> v2:
> - fixed config name in subject and patch description
> ---
>  arch/x86/Kconfig        |  4 ++++
>  include/linux/huge_mm.h | 10 ++++++++++
>  mm/Kconfig              |  3 +++
>  3 files changed, 17 insertions(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 69188841717a..a24bc11c7aed 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2276,6 +2276,10 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
>  	def_bool y
>  	depends on X86_64 && HUGETLB_PAGE && MIGRATION
>  
> +config ARCH_ENABLE_THP_MIGRATION
> +	def_bool y
> +	depends on X86_64 && TRANSPARENT_HUGEPAGE && MIGRATION
> +

TRANSPARENT_HUGEPAGE implies MIGRATION due to COMPACTION.


-- 
 Kirill A. Shutemov