linux-kernel - 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)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Alex Thorlton <athorlton@....com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Dave Jones <davej@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Kees Cook <keescook@...omium.org>,
	Mel Gorman <mgorman@...e.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Robin Holt <robinmholt@...il.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv4 00/10] split page table lock for PMD tables

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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