Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardownof hugetlbfs shared page tables V2 (resend)

[Rik van Riel]

On 07/31/2012 08:46 AM, Mel Gorman wrote:

> mm: hugetlbfs: Correctly detect if page tables have just been shared
>
> Each page mapped in a processes address space must be correctly
> accounted for in _mapcount. Normally the rules for this are
> straight-forward but hugetlbfs page table sharing is different.
> The page table pages at the PMD level are reference counted while
> the mapcount remains the same. If this accounting is wrong, it causes
> bugs like this one reported by Larry Woodman

> Signed-off-by: Mel Gorman<mgorman@xxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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