Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757720Ab3JNUnX (ORCPT ); Mon, 14 Oct 2013 16:43:23 -0400 Received: from terminus.zytor.com ([198.137.202.10]:56919 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932153Ab3JNUnT (ORCPT ); Mon, 14 Oct 2013 16:43:19 -0400 Message-ID: <525C5727.7000603@zytor.com> Date: Mon, 14 Oct 2013 13:42:15 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Yinghai Lu , Tejun Heo CC: Zhang Yanfei , Zhang Yanfei , Toshi Kani , Ingo Molnar , Andrew Morton , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH part2 v2 0/8] Arrange hotpluggable memory as ZONE_MOVABLE References: <525B19C3.9040907@gmail.com> <20131014133835.GG4722@htj.dyndns.org> <525BFCF3.5010908@gmail.com> <20131014142719.GI4722@htj.dyndns.org> <525C02DC.4050706@gmail.com> <20131014145131.GJ4722@htj.dyndns.org> <525C0866.2010808@gmail.com> <20131014151902.GL4722@htj.dyndns.org> <525C0EFE.2010409@gmail.com> <20131014200437.GA5720@htj.dyndns.org> In-Reply-To: X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 963 Lines: 24 On 10/14/2013 01:37 PM, Yinghai Lu wrote: >> >> Optimizing NUMA boot just requires moving the heavy lifting to >> appropriate NUMA nodes. It doesn't require that early boot phase >> should strictly follow NUMA node boundaries. > > At end of day, I like to see all numa system (ram/cpu/pci) could have > non boot nodes to be hot-removed logically. with any boot command > line. > I don't think that is realistic without hardware support, simply because all it takes is a single page of kernel locked memory to prevent a page from being removed. The only realistic way around that, I believe, is to remove the identity-mapping in the kernel, but it still has all kinds of funnies involving devices and DMA. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/