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Subject: Re: specjbb2005 fails with 2.6.29-rc4
From: Lin Ming <ming.m.lin@intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Mel Gorman <mel@csn.ul.ie>
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Date: Thu, 12 Feb 2009 11:23:55 +0800
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On Thu, 2009-02-12 at 09:35 +0800, Linus Torvalds wrote:
> 
> On Thu, 12 Feb 2009, Lin Ming wrote:
> > 
> > Test with Jrockit VM fails. And it works well if OpenJDK is used
> > instead.
> 
> I suspect maybe it uses hugetlbs?
> 
> There were a couple of commits to fix VM_ACCOUNT for hugepage areas 
> recently. See
> 
>  - 5a6fe125950676015f5108fb71b2a67441755003: "Do not account for the 
>    address space used by hugetlbfs using VM_ACCOUNT"
> 
>  - 17c9d12e126cb0de8d535dc1908c4819d712bc68: "Do not account for hugetlbfs 
>    quota at mmap() time if mapping [SHM|MAP]_NORESERVE"
> 
> because hugetlb mappings have their own magical VM accounting.
> 
> So can you check if current -git fixes it?

Yes, current -git fixes it.

Lin Ming