From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 5 May 2001 11:38:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 5 May 2001 11:38:01 -0400 Received: from f00f.stub.clear.net.nz ([203.167.224.51]:46096 "HELO metastasis.f00f.org") by vger.kernel.org with SMTP id ; Sat, 5 May 2001 11:37:49 -0400 Date: Sun, 6 May 2001 03:37:46 +1200 From: Chris Wedgwood To: Peter Rival Cc: Anton Blanchard , linux-kernel@vger.kernel.org Subject: Re: [PATCH] CPU hot swap for 2.4.3 + s390 support Message-ID: <20010506033746.A30690@metastasis.f00f.org> In-Reply-To: <20010505063726.A32232@va.samba.org> <3AF4118F.330C3E86@zk3.dec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3AF4118F.330C3E86@zk3.dec.com>; from frival@zk3.dec.com on Sat, May 05, 2001 at 10:43:27AM -0400 X-No-Archive: Yes Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, May 05, 2001 at 10:43:27AM -0400, Peter Rival wrote: Has anyone looked into memory hot swap/hot add support? Adding memory probably isn't going to be too hard... but taking existing memory off line is tricky. You have to find some way of finding all the pages that are in use and then dealing with them appropriately, and when some are locked or contain kernel data this would be extremely difficult I should think. Especially with systems with Chipkill coming out, this would be great to support... Chipkill? --cw