From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx168.postini.com [74.125.245.168]) by kanga.kvack.org (Postfix) with SMTP id 6246A6B005A for ; Fri, 14 Sep 2012 12:24:34 -0400 (EDT) From: "Luck, Tony" Subject: RE: [PATCH RESEND] memory hotplug: fix a double register section info bug Date: Fri, 14 Sep 2012 16:24:32 +0000 Message-ID: <3908561D78D1C84285E8C5FCA982C28F19D40E81@ORSMSX108.amr.corp.intel.com> References: <5052A7DF.4050301@gmail.com> <20120914095230.GE11266@suse.de> In-Reply-To: <20120914095230.GE11266@suse.de> Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , qiuxishi Cc: "akpm@linux-foundation.org" , Jiang Liu , "qiuxishi@huawei.com" , "bessel.wang@huawei.com" , "wujianguo@huawei.com" , "paul.gortmaker@windriver.com" , "kamezawa.hiroyu@jp.fujitsu.com" , "kosaki.motohiro@jp.fujitsu.com" , "rientjes@google.com" , Minchan Kim , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Wen Congyang > This is an unusual configuration but it's not unheard of. PPC64 in rare > (and usually broken) configurations can have one node span another. Tony > should know if such a configuration is normally allowed on Itanium or if > this should be considered a platform bug. Tony? We definitely have platforms where the physical memory on node 0 that we skipped to leave physical address space for PCI mem mapped devices gets tagged back at the very top of memory, after other nodes. E.g. A 2-node system with 8G on each might look like this: 0-2G RAM on node 0 2G-4G PCI map space 4G-8G RAM on node 0 8G-16GRAM on node 1 16G-18G RAM on node 0 Is this the situation that we are talking about? Or something different? -Tony -- 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