linux-kernel - Re: [PATCHv4 07/39] thp, mm: basic defines for transparent huge page cache

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Date:	Thu, 23 May 2013 18:36:39 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Dave Hansen <dave@...1.net>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 07/39] thp, mm: basic defines for transparent huge page cache

On Sun, May 12, 2013 at 9:23 AM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>

Better if one or two sentences are prepared to show that the following
defines are necessary.

> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  include/linux/huge_mm.h |    8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 528454c..6b4c9b2 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -64,6 +64,10 @@ extern pmd_t *page_check_address_pmd(struct page *page,
>  #define HPAGE_PMD_MASK HPAGE_MASK
>  #define HPAGE_PMD_SIZE HPAGE_SIZE
>
> +#define HPAGE_CACHE_ORDER      (HPAGE_SHIFT - PAGE_CACHE_SHIFT)
> +#define HPAGE_CACHE_NR         (1L << HPAGE_CACHE_ORDER)
> +#define HPAGE_CACHE_INDEX_MASK (HPAGE_CACHE_NR - 1)
> +
>  extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
>
>  #define transparent_hugepage_enabled(__vma)                            \
> @@ -185,6 +189,10 @@ extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vm
>  #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
>  #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
>
> +#define HPAGE_CACHE_ORDER      ({ BUILD_BUG(); 0; })
> +#define HPAGE_CACHE_NR         ({ BUILD_BUG(); 0; })
> +#define HPAGE_CACHE_INDEX_MASK ({ BUILD_BUG(); 0; })
> +
>  #define hpage_nr_pages(x) 1
>
>  #define transparent_hugepage_enabled(__vma) 0
> --
> 1.7.10.4
>
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