linux-kernel - Re: [PATCH] mm: add page_check_address

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Date:	Fri, 6 Nov 2015 17:24:33 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] mm: add page_check_address_transhuge helper

On Fri, Nov 06, 2015 at 05:37:07PM +0300, Vladimir Davydov wrote:
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 0837487d3737..7ac775e41820 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -796,48 +796,43 @@ int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma)
>  	return 1;
>  }
>  
> -struct page_referenced_arg {
> -	int mapcount;
> -	int referenced;
> -	unsigned long vm_flags;
> -	struct mem_cgroup *memcg;
> -};
>  /*
> - * arg: page_referenced_arg will be passed
> + * Check that @page is mapped at @address into @mm. In contrast to
> + * page_check_address(), this function can handle transparent huge pages.
> + *
> + * On success returns true with pte mapped and locked. For transparent huge
> + * pages *@...p is set to NULL.

I think

	"For PMD-mapped transparent huge pages"...

would be more correct.

Otherwise looks great!

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov
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