linux-kernel - Re: Over-eager swapping

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Message-ID: <20100818162000.GA15859@localhost>
Date:	Thu, 19 Aug 2010 00:20:00 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Chris Webb <chris@...chsys.com>,
	Minchan Kim <minchan.kim@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andi Kleen <andi@...stfloor.org>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: Over-eager swapping

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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