Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750718AbWCYC5M (ORCPT ); Fri, 24 Mar 2006 21:57:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750737AbWCYC5M (ORCPT ); Fri, 24 Mar 2006 21:57:12 -0500 Received: from smtp.osdl.org ([65.172.181.4]:4481 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1750718AbWCYC5L (ORCPT ); Fri, 24 Mar 2006 21:57:11 -0500 Date: Fri, 24 Mar 2006 18:53:31 -0800 From: Andrew Morton To: "Chen, Kenneth W" Cc: mrustad@mac.com, linux-kernel@vger.kernel.org Subject: Re: 2.6.16 hugetlbfs problem - DEBUG_PAGEALLOC Message-Id: <20060324185331.56837b0a.akpm@osdl.org> In-Reply-To: <200603250124.k2P1OKg21526@unix-os.sc.intel.com> References: <200603250124.k2P1OKg21526@unix-os.sc.intel.com> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 949 Lines: 21 "Chen, Kenneth W" wrote: > > Mark Rustad wrote on Friday, March 24, 2006 9:52 AM > > I have narrowed this down to DEBUG_PAGEALLOC. If that option is > > enabled, attempts to reference areas mmap-ed from hugetlbfs files > > fault forever. You can see that I had that set in the failing config > > I reported below. > > Yeah, it turns out that the debug option is not compatible with hugetlb > page support. That debug option turns off PSE. Once it is turned off in > CR4, cpu will ignore pse bit in the pmd and causing infinite page-not- > present fault :-( I wonder if any of the other architectures which implement both these features might have problems too. - 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/