Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422652AbWBIK5m (ORCPT ); Thu, 9 Feb 2006 05:57:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422666AbWBIK5m (ORCPT ); Thu, 9 Feb 2006 05:57:42 -0500 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:11230 "EHLO fgwmail5.fujitsu.co.jp") by vger.kernel.org with ESMTP id S1422652AbWBIK5l (ORCPT ); Thu, 9 Feb 2006 05:57:41 -0500 Date: Thu, 09 Feb 2006 19:56:48 +0900 From: Yasunori Goto To: Andi Kleen , "Tolentino, Matthew E" Subject: Re: [discuss] Re: [RFC:PATCH(003/003)] Memory add to onlined node. (ver. 2) (For x86_64) Cc: discuss@x86-64.org, "Brown, Len" , naveen.b.s@intel.com, Bjorn Helgaas , Linux Kernel ML , ACPI-ML , Linux Hotplug Memory Support In-Reply-To: <200602091141.44456.ak@suse.de> References: <20060209164036.6CFC.Y-GOTO@jp.fujitsu.com> <200602091141.44456.ak@suse.de> X-Mailer-Plugin: BkASPil for Becky!2 Ver.2.063 Message-Id: <20060209195345.6D06.Y-GOTO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.24.02 [ja] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1283 Lines: 41 > On Thursday 09 February 2006 10:50, Yasunori Goto wrote: > > > Current code adds memory to ZONE_NORMAL like this. > > But, ZONE_DMA32 is available on 2.6.15. So, I'm afraid there are > > 2 types trouble. > > > > a) When new memory is added to < 4GB, this should be added to > > Zone_DMA32. > > Are there any real machine which allow to add memory under > > 4GB? > > x86-64 machines usually use a continuous memory map > because Windows gets unhappy with too big memory holes (and even > Linux is not completely troublefree for UP install kernels) And for a small > system this implies memory < 4GB. Ah, Ok. Then, it is bug. :-P > > > b) If machine boots up with under 4GB memory, and new memory > > is added to over 4GB, then kernel might panic due to Zone Normal's > > initialization is imcomplete. > > > > Q2) > > Are there any real machine which can add memory with NUMA feature? > > There are and will be. I see. I'll continue my job with x86_64 too. :-) Thanks. -- Yasunori Goto - 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/