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Date:	Thu, 02 Oct 2014 12:19:11 -0400
From:	Rik van Riel <>
To:	Mel Gorman <>, Dave Jones <>
CC:	Linus Torvalds <>,
	Hugh Dickins <>,
	Al Viro <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Aneesh Kumar <>,
	Michel Lespinasse <>,
	Kirill A Shutemov <>,
	Linux Kernel <>
Subject: Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte_numa when splitting
 huge pages

On 10/02/2014 09:29 AM, Mel Gorman wrote:
> This patch reverts 1ba6e0b50b ("mm: numa: split_huge_page: transfer the
> NUMA type from the pmd to the pte"). If a huge page is being split due
> a protection change and the tail will be in a PROT_NONE vma then NUMA
> hinting PTEs are temporarily created in the protected VMA.
> |-----------------|
>       ^
>       split here
> In the specific case above, it should get fixed up by change_pte_range()
> but there is a window of opportunity for weirdness to happen. Similarly,
> if a huge page is shrunk and split during a protection update but before
> pmd_numa is cleared then a pte_numa can be left behind.
> Instead of adding complexity trying to deal with the case, this patch
> will not mark PTEs NUMA when splitting a huge page. NUMA hinting faults
> will not be triggered which is marginal in comparison to the complexity
> in dealing with the corner cases during THP split.
> Signed-off-by: Mel Gorman <>

Acked-by: Rik van Riel <>

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