From mboxrd@z Thu Jan 1 00:00:00 1970 From: kamezawa.hiroyu@jp.fujitsu.com Message-ID: <6693458.1220717142061.kamezawa.hiroyu@jp.fujitsu.com> Date: Sun, 7 Sep 2008 01:05:42 +0900 (JST) Subject: Re: Re: Re: [PATCH] [RESEND] x86_64: add memory hotremove config option In-Reply-To: <9031244.1220716855172.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-2022-jp" Content-Transfer-Encoding: 7bit References: <9031244.1220716855172.kamezawa.hiroyu@jp.fujitsu.com> <20080906143318.GA23621@elte.hu> <20080905215452.GF11692@us.ibm.com> <20080906000154.GC18288@one.firstfloor.org> <20080906153855.7260.E1E9C6FF@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org Return-Path: To: kamezawa.hiroyu@jp.fujitsu.com Cc: Ingo Molnar , Yasunori Goto , Andi Kleen , Gary Hade , linux-mm@kvack.org, Andrew Morton , Badari Pulavarty , Mel Gorman , Chris McDermott , linux-kernel@vger.kernel.org, x86@kernel.org List-ID: ----- Original Message ----- >>Having said that, i have my doubts about its generic utility (the power >>saving aspects are likely not realizable - nobody really wants DIMMs to >>just sit there unused and the cost of dynamic migration is just >>horrendous) - but as long as it's opt-in there's no reason to limit the >>availability of an in-kernel feature artificially. > >Nobody ? maybe just a trade-off problem in user side. >Even without DIMM hotplug or DIMM's power save mode, making a DIMM idle >is of no use ? I think memory consumes much power when it used. >Memory Hotplug and ZONE_MOVABLE can make some memory idle. >(I'm sorry if my thinking is wrong.) > But I have to point out HDD access consumes far power than memory. That's trade-off problem depends on usage, anyway. Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org