linux-kernel - Re: [PATCH 10/11] Direct compact when a high-order allocation fails

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Message-Id: <20100325202145.6C92.A69D9226@jp.fujitsu.com>
Date:	Thu, 25 Mar 2010 20:22:10 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 10/11] Direct compact when a high-order allocation fails

> > Viewpoint 5. end user surprising
> > 
> > lumpy reclaim can makes swap-out even though the system have lots free
> > memory. end users very surprised it and they can think it is bug.
> > 
> > Also, this swap activity easyly confuse that an administrator decide when
> > install more memory into the system.
> > 
> 
> Compaction in this case is a lot less surprising. If there is enough free
> memory, compaction will trigger automatically without any reclaim.

I fully agree this.


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