linux-kernel - Re: [PATCH 00/49] Automatic NUMA Balancing v10

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Message-ID: <20121209211708.GA29607@shutemov.name>
Date:	Sun, 9 Dec 2012 23:17:09 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Hillf Danton <dhillf@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/49] Automatic NUMA Balancing v10

On Sun, Dec 09, 2012 at 08:36:31PM +0000, Mel Gorman wrote:
> Either way, last night I applied a patch on top of latest tip/master to
> remove the nr_cpus_allowed check so that numacore would be enabled again
> and tested that. In some places it has indeed much improved. In others
> it is still regressing badly and in two case, it's corrupting memory --
> specjbb when THP is enabled crashes when running for single or multiple
> JVMs. It is likely that a zero page is being inserted due to a race with
> migration and causes the JVM to throw a null pointer exception. Here is
> the comparison on the rough off-chance you actually read it this time.

Are you talking about huge zero page, right?

I've fixed a race in huge zero page implementation recently[1]. Symptoms
were similar -- SIGSEGV in JVM. The patch is in mmotm-2012-12-05-16-56 and
later.

[1] http://lkml.org/lkml/2012/11/30/279
-- 
 Kirill A. Shutemov
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