From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e34.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id m5K3IQSE029717 for ; Thu, 19 Jun 2008 23:18:26 -0400 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.0) with ESMTP id m5K3IPKh122866 for ; Thu, 19 Jun 2008 21:18:25 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m5K3IPXe009664 for ; Thu, 19 Jun 2008 21:18:25 -0600 Message-ID: <485B2180.10507@us.ibm.com> Date: Thu, 19 Jun 2008 22:18:24 -0500 From: Jon Tollefson Reply-To: kniht@linux.vnet.ibm.com MIME-Version: 1.0 Subject: Re: 2.6.26-rc5-mm3: BUG large value for HugePages_Rsvd References: <20080611225945.4da7bb7f.akpm@linux-foundation.org> <485A8903.9030808@linux.vnet.ibm.com> <20080619171644.GC13275@shadowen.org> In-Reply-To: <20080619171644.GC13275@shadowen.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andy Whitcroft Cc: Jon Tollefson , Andrew Morton , linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org, linux-mm@kvack.org, Nick Piggin , Nishanth Aravamudan , Adam Litke List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org