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 16:57:34 -0400
From:	Larry Woodman <lwoodman@...hat.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, 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 04:06 PM, Michal Hocko wrote:
> On Tue 31-07-12 13:49:21, Larry Woodman wrote:
>> On 07/31/2012 08:46 AM, Mel Gorman wrote:
>>> Fundamentally I think the problem is that we are not correctly detecting
>>> that page table sharing took place during huge_pte_alloc(). This patch is
>>> longer and makes an API change but if I'm right, it addresses the underlying
>>> problem. The first VM_MAYSHARE patch is still necessary but would you mind
>>> testing this on top please?
>> Hi Mel, yes this does work just fine.  It ran for hours without a panic so
>> I'll Ack this one if you send it to the list.
> Hi Larry, thanks for testing! I have a different patch which tries to
> address this very same issue. I am not saying it is better or that it
> should be merged instead of Mel's one but I would be really happy if you
> could give it a try. We can discuss (dis)advantages of both approaches
> later.
>
> Thanks!
Sure, it will take me a day since I keep loosing the hardware to 
proproduce the
problem with.  I'll report back tomorrow.

Larry

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