From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f46.google.com (mail-pb0-f46.google.com [209.85.160.46]) by kanga.kvack.org (Postfix) with ESMTP id 8EE576B0031 for ; Wed, 9 Oct 2013 15:30:45 -0400 (EDT) Received: by mail-pb0-f46.google.com with SMTP id rq2so1386962pbb.5 for ; Wed, 09 Oct 2013 12:30:45 -0700 (PDT) Message-ID: <5255AEC1.7040500@intel.com> Date: Wed, 09 Oct 2013 12:30:09 -0700 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up References: <524E2032.4020106@gmail.com> <524E2127.4090904@gmail.com> <5251F9AB.6000203@zytor.com> <525442A4.9060709@gmail.com> <20131009164449.GG22495@htj.dyndns.org> <52558EEF.4050009@gmail.com> <20131009192040.GA5592@mtj.dyndns.org> In-Reply-To: <20131009192040.GA5592@mtj.dyndns.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Tejun Heo , Zhang Yanfei Cc: "H. Peter Anvin" , Andrew Morton , "Rafael J . Wysocki" , lenb@kernel.org, Thomas Gleixner , mingo@elte.hu, Toshi Kani , Wanpeng Li , Thomas Renninger , Yinghai Lu , Jiang Liu , Wen Congyang , Lai Jiangshan , isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, Mel Gorman , Minchan Kim , mina86@mina86.com, gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com, Rik van Riel , jweiner@redhat.com, prarit@redhat.com, "x86@kernel.org" , linux-doc@vger.kernel.org, "linux-kernel@vger.kernel.org" , Linux MM , linux-acpi@vger.kernel.org, imtangchen@gmail.com, Zhang Yanfei , Tang Chen On 10/09/2013 12:20 PM, Tejun Heo wrote: > Realistically tho, why would people be using 4k mappings on 2T > machines? CONFIG_DEBUG_PAGEALLOC and CONFIG_KMEMCHECK both disable using >4k pages. I actually ran in to this on a 1TB machine a few weeks ago: https://lkml.org/lkml/2013/8/9/546 So it's not a common case for stuff that customers have, but it sure as *HECK* is needed for debugging. -- 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