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List:       linux-mm
Subject:    Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V
From:       Larry Woodman <lwoodman () redhat ! com>
Date:       2012-07-31 20:57:34
Message-ID: 501846BE.6000004 () redhat ! com
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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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