linux-kernel - Re: [PATCH] mm: thp: Set the accessed flag for old pages on access fault.

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Message-ID: <20121001140305.GA20173@shutemov.name>
Date:	Mon, 1 Oct 2012 17:03:05 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, akpm@...ux-foundation.org,
	mhocko@...e.cz, Steve Capper <steve.capper@....com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: Re: [PATCH] mm: thp: Set the accessed flag for old pages on access
 fault.

On Mon, Oct 01, 2012 at 02:51:45PM +0100, Will Deacon wrote:
> diff --git a/mm/memory.c b/mm/memory.c
> index 5736170..d5c007d 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3537,7 +3537,11 @@ retry:
>  				if (unlikely(ret & VM_FAULT_OOM))
>  					goto retry;
>  				return ret;
> +			} else {
> +				huge_pmd_set_accessed(mm, vma, address, pmd,
> +						      orig_pmd);

I think putting it to 'else' is wrong. You should not touch pmd, if it's
under splitting.

>  			}
> +
>  			return 0;
>  		}
>  	}

-- 
 Kirill A. Shutemov
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