From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <455C8875.3070109@mbligh.org> Date: Thu, 16 Nov 2006 07:49:09 -0800 From: "Martin J. Bligh" MIME-Version: 1.0 Subject: Re: [patch 2/2] enables booting a NUMA system where some nodes have no memory References: <20061115193049.3457b44c@localhost> <20061115193437.25cdc371@localhost> <20061115215845.GB20526@sgi.com> <455B9825.3030403@mbligh.org> <20061116095429.0e6109a7.kamezawa.hiroyu@jp.fujitsu.com> <20061116164037.58b3aaeb@localhost> In-Reply-To: <20061116164037.58b3aaeb@localhost> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christian Krafft Cc: Christoph Lameter , KAMEZAWA Hiroyuki , steiner@sgi.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: Christian Krafft wrote: > On Wed, 15 Nov 2006 16:57:56 -0800 (PST) > Christoph Lameter wrote: > >> On Thu, 16 Nov 2006, KAMEZAWA Hiroyuki wrote: >> >>>> But there is no memory on the node. Does the zonelist contain the zones of >>>> the node without memory or not? We simply fall back each allocation to the >>>> next node as if the node was overflowing? >>> yes. just fallback. >> Ok, so we got a useless pglist_data struct and the struct zone contains a >> zonelist that does not include the zone. > > Okay, I slowly understand what you are talking about. > I just tried a "numactl --cpunodebind 1 --membind 1 true" which hit an uninitialized zone in slab_node: > > return zone_to_nid(policy->v.zonelist->zones[0]); > > I also still don't know if it makes sense to have memoryless nodes, but supporting it does. > So wath would be reasonable, to have empty zonelists for those node, or to check if zonelists are uninitialized ? You don't want empty zonelists on a node containing CPUs, else it won't know where to allocate from. You just want to make sure that the zones in that node (if existant) are not contained in *anyone's* zonelist. M. -- 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