linux-kernel - Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend)

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Date:	Tue, 31 Jul 2012 14:03:57 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Larry Woodman <lwoodman@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	Linux-MM <linux-mm@...ck.org>,
	David Gibson <david@...son.dropbear.id.au>,
	Ken Chen <kenchen@...gle.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown
 of hugetlbfs shared page tables V2 (resend)

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@...e.de>

Reviewed-by: Rik van Riel <riel@...hat.com>

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