From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx116.postini.com [74.125.245.116]) by kanga.kvack.org (Postfix) with SMTP id 4F8466B0006 for ; Thu, 17 Jan 2013 16:55:40 -0500 (EST) Received: from /spool/local by e8.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 17 Jan 2013 16:55:39 -0500 Received: from d01relay05.pok.ibm.com (d01relay05.pok.ibm.com [9.56.227.237]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id C08A938C801C for ; Thu, 17 Jan 2013 16:55:34 -0500 (EST) Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay05.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r0HLtY2Y316578 for ; Thu, 17 Jan 2013 16:55:34 -0500 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r0HLtXRo005914 for ; Thu, 17 Jan 2013 16:55:34 -0500 Message-ID: <50F8734C.2080906@linux.vnet.ibm.com> Date: Thu, 17 Jan 2013 13:55:24 -0800 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [RFC] Reproducible OOM with just a few sleeps References: <201301172104.r0HL4F9k005128@como.maths.usyd.edu.au> In-Reply-To: <201301172104.r0HL4F9k005128@como.maths.usyd.edu.au> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: paul.szabo@sydney.edu.au Cc: psz@maths.usyd.edu.au, 695182@bugs.debian.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org On 01/17/2013 01:04 PM, paul.szabo@sydney.edu.au wrote: >>> On my large machine, 'free' fails to show about 2GB memory ... >> You probably have a memory hole. ... >> The e820 map (during early boot in dmesg) or /proc/iomem will let you >> locate your memory holes. > > Now that my machine is running an amd64 kernel, 'free' shows total Mem > 65854128 (up from 64447796 with PAE kernel), and I do not see much > change in /proc/iomem output (below). Is that as should be? Yeah, that all looks sane. Your increased memory is because your 64GB machine had some of its memory mapped _above_ the 64GB physical memory limit that PAE has. /proc/iomem is generally just a dump of what the hardware *is*, so it shouldn't change between kernels. -- 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