From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <473A7A0B.5030300@arca.com.cn> Date: Wed, 14 Nov 2007 12:31:07 +0800 From: "Jacky(GuangXiang Lee)" MIME-Version: 1.0 Subject: Re: about page migration on UMA References: <20071016191949.cd50f12f.kamezawa.hiroyu@jp.fujitsu.com> <20071016192341.1c3746df.kamezawa.hiroyu@jp.fujitsu.com> <20071017141609.0eb60539.kamezawa.hiroyu@jp.fujitsu.com> <20071017145009.e4a56c0d.kamezawa.hiroyu@jp.fujitsu.com> <02f001c8108c$a3818760$3708a8c0@arcapub.arca.com> <6934efce0711091131n1acd2ce1h7bb17f9f3cb0f235@mail.gmail.com> In-Reply-To: <6934efce0711091131n1acd2ce1h7bb17f9f3cb0f235@mail.gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Return-Path: To: Jared Hulbert Cc: Christoph Lameter , climeter@sgi.com, linux-mm@kvack.org List-ID: Jared Hulbert a??e??: > On 10/18/07, Christoph Lameter wrote: > >> On Wed, 17 Oct 2007, Jacky(GuangXiang Lee) wrote: >> >> >>> seems page migration is used mostly for NUMA platform to improve >>> performance. >>> But in a UMA architecture, Is it possible to use page migration to move >>> pages ? >>> >> Yes. Just one up with a usage for it. The page migration mechanism itself >> is not NUMA dependent. >> > > For extreme low power systems it would be possible to shut down banks > in SDRAM chips that were not full thereby saving power. That would > require some defraging and migration to empty them prior to powering > down those banks. > > what is the way to shut down banks in SDRAM chips? -- 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