linux-kernel - Re: 2.6.26-rc5-mm3: BUG large value for HugePages

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Date:	Thu, 19 Jun 2008 22:18:24 -0500
From:	Jon Tollefson <kniht@...ibm.com>
To:	Andy Whitcroft <apw@...dowen.org>
CC:	Jon Tollefson <kniht@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	linux-mm@...ck.org, Nick Piggin <npiggin@...e.de>,
	Nishanth Aravamudan <nacc@...ibm.com>,
	Adam Litke <agl@...ux.vnet.ibm.com>
Subject: Re: 2.6.26-rc5-mm3: BUG large value for HugePages_Rsvd

Andy Whitcroft wrote:
> On Thu, Jun 19, 2008 at 11:27:47AM -0500, Jon Tollefson wrote:
>   
>> After running some of the libhugetlbfs tests the value for
>> /proc/meminfo/HugePages_Rsvd becomes really large.  It looks like it has
>> wrapped backwards from zero.
>> Below is the sequence I used to run one of the tests that causes this;
>> the tests passes for what it is intended to test but leaves a large
>> value for reserved pages and that seemed strange to me.
>> test run on ppc64 with 16M huge pages
>>     
>
> Yes Adam reported that here yesterday, he found it in his hugetlfs testing.
> I have done some investigation on it and it is being triggered by a bug in
> the private reservation tracking patches.  It is triggered by the hugetlb
> test which causes some complex vma splits to occur on a private mapping.
>   
sorry I missed that

> I believe I have the underlying problem nailed and do have some nearly
> complete patches for this and they should be in a postable state by
> tommorrow.
>   
Cool.
> -apw
>   
Jon

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