linux-kernel - Re: specjbb2005 fails with 2.6.29-rc4

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Message-Id: <1234409035.7699.34.camel@minggr.sh.intel.com>
Date:	Thu, 12 Feb 2009 11:23:55 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: specjbb2005 fails with 2.6.29-rc4

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

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