From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753338Ab0CHC6r (ORCPT ); Sun, 7 Mar 2010 21:58:47 -0500 Received: from one.firstfloor.org ([213.235.205.2]:53704 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751900Ab0CHC6k (ORCPT ); Sun, 7 Mar 2010 21:58:40 -0500 Date: Mon, 8 Mar 2010 03:58:35 +0100 From: Andi Kleen To: Anca Emanuel Cc: Nick Piggin , David Rientjes , Pekka Enberg , Andi Kleen , Christoph Lameter , linux-kernel , linux-mm , "haicheng.li" , KAMEZAWA Hiroyuki Subject: Re: [patch] slab: add memory hotplug support Message-ID: <20100308025835.GC20695@one.firstfloor.org> References: <20100226114136.GA16335@basil.fritz.box> <20100226155755.GE16335@basil.fritz.box> <20100305062002.GV8653@laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 05, 2010 at 02:47:04PM +0200, Anca Emanuel wrote: > Dumb question: it is possible to hot remove the (bad) memory ? And add > an good one ? Not the complete DIMM, but if a specific page containing a stuck bit or similar can be removed since 2.6.33 yes In theory you could add new memory replacing that memory if your hardware and your kernel supports that, but typically that's not worth it for a few K. > Where is the detection code for the bad module ? Part of the code is in the kernel, part in mcelog. It only works with ECC memory and supported systems ATM (currently Nehalem class Intel Xeon systems) -Andi -- ak@linux.intel.com -- Speaking for myself only. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id 170D16B0047 for ; Sun, 7 Mar 2010 21:58:38 -0500 (EST) Date: Mon, 8 Mar 2010 03:58:35 +0100 From: Andi Kleen Subject: Re: [patch] slab: add memory hotplug support Message-ID: <20100308025835.GC20695@one.firstfloor.org> References: <20100226114136.GA16335@basil.fritz.box> <20100226155755.GE16335@basil.fritz.box> <20100305062002.GV8653@laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org To: Anca Emanuel Cc: Nick Piggin , David Rientjes , Pekka Enberg , Andi Kleen , Christoph Lameter , linux-kernel , linux-mm , "haicheng.li" , KAMEZAWA Hiroyuki List-ID: On Fri, Mar 05, 2010 at 02:47:04PM +0200, Anca Emanuel wrote: > Dumb question: it is possible to hot remove the (bad) memory ? And add > an good one ? Not the complete DIMM, but if a specific page containing a stuck bit or similar can be removed since 2.6.33 yes In theory you could add new memory replacing that memory if your hardware and your kernel supports that, but typically that's not worth it for a few K. > Where is the detection code for the bad module ? Part of the code is in the kernel, part in mcelog. It only works with ECC memory and supported systems ATM (currently Nehalem class Intel Xeon systems) -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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