From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id E4EE96B0279 for ; Fri, 26 May 2017 15:23:34 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id e131so23971466pfh.7 for ; Fri, 26 May 2017 12:23:34 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTPS id t64si1737322pfg.350.2017.05.26.12.23.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 May 2017 12:23:34 -0700 (PDT) Subject: Re: [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging References: <20170525203334.867-1-kirill.shutemov@linux.intel.com> <20170526130057.t7zsynihkdtsepkf@node.shutemov.name> <83F4880B-5D1F-4576-A9B6-7DDF4173E2E5@zytor.com> From: Dave Hansen Message-ID: <40d58ba7-277c-6f4e-a4d7-15425d675dbf@intel.com> Date: Fri, 26 May 2017 12:23:18 -0700 MIME-Version: 1.0 In-Reply-To: <83F4880B-5D1F-4576-A9B6-7DDF4173E2E5@zytor.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, Linus Torvalds , "Kirill A. Shutemov" Cc: "Kirill A. Shutemov" , Andrew Morton , the arch/x86 maintainers , Thomas Gleixner , Ingo Molnar , Andi Kleen , Andy Lutomirski , "linux-arch@vger.kernel.org" , linux-mm , Linux Kernel Mailing List On 05/26/2017 11:24 AM, hpa@zytor.com wrote: > The only case where that even has any utility is for an application > to want more than 128 TiB address space on a machine with no more > than 64 TiB of RAM. It is kind of a narrow use case, I think. Doesn't more address space increase the effectiveness of ASLR? I thought KASLR, especially, was limited in its effectiveness because of a lack of address space. -- 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