Date: Thu, 19 Aug 2010 00:20:00 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Chris Webb <chris@arachsys.com>, Minchan Kim <minchan.kim@gmail.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Pekka Enberg <penberg@cs.helsinki.fi>,
        Andi Kleen <andi@firstfloor.org>,
        Lee Schermerhorn <lee.schermerhorn@hp.com>
Subject: Re: Over-eager swapping
Message-ID: <20100818162000.GA15859@localhost>
References: <20100804022148.GA5922@localhost>
 <AANLkTi=wRPXY9BTuoCe_sDCwhnRjmmwtAf_bjDKG3kXQ@mail.gmail.com>
 <20100804032400.GA14141@localhost>
 <20100804095811.GC2326@arachsys.com>
 <20100804114933.GA13527@localhost>
 <20100804120430.GB23551@arachsys.com>
 <20100818143801.GA9086@localhost>
 <20100818144655.GX2370@arachsys.com>
 <20100818152103.GA11268@localhost>
 <alpine.DEB.2.00.1008181056350.4025@router.home>
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On Wed, Aug 18, 2010 at 11:57:09PM +0800, Christoph Lameter wrote:
> On Wed, 18 Aug 2010, Wu Fengguang wrote:
> 
> > Andi, Christoph and Lee:
> >
> > This looks like an "unbalanced NUMA memory usage leading to premature
> > swapping" problem.
> 
> Is zone reclaim active? It may not activate on smaller systems leading
> to an unbalance memory usage between node.

Another possibility is, there are many low watermark page allocations,
leading to kswapd page out activities.

Thanks,
Fengguang
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