Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932392AbaFWU2g (ORCPT ); Mon, 23 Jun 2014 16:28:36 -0400 Received: from mga09.intel.com ([134.134.136.24]:41060 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755379AbaFWU2f (ORCPT ); Mon, 23 Jun 2014 16:28:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,532,1400050800"; d="scan'208";a="562077486" Message-ID: <53A88DE4.8050107@intel.com> Date: Mon, 23 Jun 2014 13:28:20 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: Andy Lutomirski CC: Qiaowei Ren , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , X86 ML , "linux-kernel@vger.kernel.org" , Linux MM Subject: Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface References: <1403084656-27284-1-git-send-email-qiaowei.ren@intel.com> <1403084656-27284-3-git-send-email-qiaowei.ren@intel.com> <53A884B2.5070702@mit.edu> <53A88806.1060908@intel.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/23/2014 01:06 PM, Andy Lutomirski wrote: > Can the new vm_operation "name" be use for this? The magic "always > written to core dumps" feature might need to be reconsidered. One thing I'd like to avoid is an MPX vma getting merged with a non-MPX vma. I don't see any code to prevent two VMAs with different vm_ops->names from getting merged. That seems like a bit of a design oversight for ->name. Right? Thinking out loud a bit... There are also some more complicated but more performant cleanup mechanisms that I'd like to go after in the future. Given a page, we might want to figure out if it is an MPX page or not. I wonder if we'll ever collide with some other user of vm_ops->name. It looks fairly narrowly used at the moment, but would this keep us from putting these pages on, say, a tmpfs mount? Doesn't look that way at the moment. -- 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/