linux-kernel - Re: [PATCH v11 2/7] x86: add pmd

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Date:	Tue, 8 Jul 2014 14:25:51 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Jason Evans <je@...com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>
Subject: Re: [PATCH v11 2/7] x86: add pmd_[dirty|mkclean] for THP

On 07/08/2014 02:03 PM, Minchan Kim wrote:
> MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent
> overwrite of the contents since MADV_FREE syscall is called for
> THP page.
> 
> This patch adds pmd_dirty and pmd_mkclean for THP page MADV_FREE
> support.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Minchan Kim <minchan@...nel.org>

Acked-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>

> ---
>  arch/x86/include/asm/pgtable.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 0ec056012618..329865799653 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -104,6 +104,11 @@ static inline int pmd_young(pmd_t pmd)
>  	return pmd_flags(pmd) & _PAGE_ACCESSED;
>  }
>  
> +static inline int pmd_dirty(pmd_t pmd)
> +{
> +	return pmd_flags(pmd) & _PAGE_DIRTY;
> +}
> +
>  static inline int pte_write(pte_t pte)
>  {
>  	return pte_flags(pte) & _PAGE_RW;
> @@ -267,6 +272,11 @@ static inline pmd_t pmd_mkold(pmd_t pmd)
>  	return pmd_clear_flags(pmd, _PAGE_ACCESSED);
>  }
>  
> +static inline pmd_t pmd_mkclean(pmd_t pmd)
> +{
> +	return pmd_clear_flags(pmd, _PAGE_DIRTY);
> +}
> +
>  static inline pmd_t pmd_wrprotect(pmd_t pmd)
>  {
>  	return pmd_clear_flags(pmd, _PAGE_RW);
> 


-- 
Thanks.
Zhang Yanfei
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