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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
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Subject: Re: [PATCHv4 00/10] split page table lock for PMD tables
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Date: Mon,  7 Oct 2013 12:48:20 +0300 (EEST)
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To: Alex Thorlton <athorlton@sgi.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, "Eric W . Biederman" <ebiederm@xmission.com>, "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>, Al Viro <viro@zeniv.linux.org.uk>, Andi Kleen <ak@linux.intel.com>, Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Dave Jones <davej@redhat.com>, David Howells <dhowells@redhat.com>, Frederic Weisbecker <fweisbec@gmail.com>, Johannes Weiner <hannes@cmpxchg.org>, Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>, Michael Kerrisk <mtk.manpages@gmail.com>, Oleg Nesterov <oleg@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>, Robin Holt <robinmholt@gmail.com>, Sedat Dilek <sedat.dilek@gmail.com>, Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org, linux-mm@kvack.org

Alex Thorlton wrote:
> > > Sorry for the delay on these results.  I hit some strange issues with
> > > running thp_memscale on systems with either of the following
> > > combinations of configuration options set:
> > > 
> > > [thp off]
> > > HUGETLBFS=y
> > > HUGETLB_PAGE=y
> > > NUMA_BALANCING=y
> > > NUMA_BALANCING_DEFAULT_ENABLED=y
> > > 
> > > [thp on or off]
> > > HUGETLBFS=n
> > > HUGETLB_PAGE=n
> > > NUMA_BALANCING=y
> > > NUMA_BALANCING_DEFAULT_ENABLED=y
> > > 
> > > I'm getting segfaults intermittently, as well as some weird RCU sched
> > > errors.  This happens in vanilla 3.12-rc2, so it doesn't have anything
> > > to do with your patches, but I thought I'd let you know.  There didn't
> > > used to be any issues with this test, so I think there's a subtle kernel
> > > bug here.  That's, of course, an entirely separate issue though.
> > 
> > I'll take a look next week, if nobody does it before.
> 
> I'm starting a bisect now.  Not sure how long it'll take, but I'll keep
> you posted.

I don't see the issue. Could you share your kernel config?

-- 
 Kirill A. Shutemov

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