From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx120.postini.com [74.125.245.120]) by kanga.kvack.org (Postfix) with SMTP id 589856B0062 for ; Wed, 12 Dec 2012 21:03:44 -0500 (EST) Message-ID: <1355364222.9244.3.camel@buesod1.americas.hpqcorp.net> Subject: Re: [PATCH] mm: add node physical memory range to sysfs From: Davidlohr Bueso Date: Wed, 12 Dec 2012 18:03:42 -0800 In-Reply-To: <50C933E9.2040707@linux.vnet.ibm.com> References: <1354919696.2523.6.camel@buesod1.americas.hpqcorp.net> <20121207155125.d3117244.akpm@linux-foundation.org> <50C28720.3070205@linux.vnet.ibm.com> <1355361524.5255.9.camel@buesod1.americas.hpqcorp.net> <50C933E9.2040707@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: Andrew Morton , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-mm@kvack.org On Wed, 2012-12-12 at 17:48 -0800, Dave Hansen wrote: > On 12/12/2012 05:18 PM, Davidlohr Bueso wrote: > > On Fri, 2012-12-07 at 16:17 -0800, Dave Hansen wrote: > >> Seems like the better way to do this would be to expose the DIMMs > >> themselves in some way, and then map _those_ back to a node. > > > > Good point, and from a DIMM perspective, I agree, and will look into > > this. However, IMHO, having the range of physical addresses for every > > node still provides valuable information, from a NUMA point of view. For > > example, dealing with node related e820 mappings. > > But if we went and did it per-DIMM (showing which physical addresses and > NUMA nodes a DIMM maps to), wouldn't that be redundant with this > proposed interface? > If DIMMs overlap between nodes, then we wouldn't have an exact range for a node in question. Having both approaches would complement each other. > How do you plan to use this in practice, btw? > It started because I needed to recognize the address of a node to remove it from the e820 mappings and have the system "ignore" the node's memory. Thanks, Davidlohr -- 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