linux-kernel - Re: [PATCH] mm: Check if PTE is already allocated during page fault

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Message-ID: <20110415143916.GN15707@random.random>
Date:	Fri, 15 Apr 2011 16:39:16 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	akpm@...ux-foundation.org, raz ben yehuda <raziebe@...il.com>,
	riel@...hat.com, kosaki.motohiro@...fujitsu.com,
	lkml <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	stable@...nel.org
Subject: Re: [PATCH] mm: Check if PTE is already allocated during page fault

On Fri, Apr 15, 2011 at 11:12:48AM +0100, Mel Gorman wrote:
> diff --git a/mm/memory.c b/mm/memory.c
> index 5823698..1659574 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3322,7 +3322,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
>  	 * run pte_offset_map on the pmd, if an huge pmd could
>  	 * materialize from under us from a different thread.
>  	 */
> -	if (unlikely(__pte_alloc(mm, vma, pmd, address)))
> +	if (unlikely(pmd_none(*pmd)) && __pte_alloc(mm, vma, pmd, address))
>  		return VM_FAULT_OOM;
>  	/* if an huge pmd materialized from under us just retry later */
>  	if (unlikely(pmd_trans_huge(*pmd)))

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>

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