From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f51.google.com (mail-pa0-f51.google.com [209.85.220.51]) by kanga.kvack.org (Postfix) with ESMTP id 0F4356B00AB for ; Thu, 26 Jun 2014 18:12:31 -0400 (EDT) Received: by mail-pa0-f51.google.com with SMTP id hz1so3707531pad.24 for ; Thu, 26 Jun 2014 15:12:31 -0700 (PDT) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTP id kn1si11596979pbd.226.2014.06.26.15.12.30 for ; Thu, 26 Jun 2014 15:12:31 -0700 (PDT) Message-ID: <53AB42E1.4090102@intel.com> Date: Wed, 25 Jun 2014 14:45:05 -0700 From: Dave Hansen MIME-Version: 1.0 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> <53A88DE4.8050107@intel.com> <9E0BE1322F2F2246BD820DA9FC397ADE016AF41C@shsmsx102.ccr.corp.intel.com> <9E0BE1322F2F2246BD820DA9FC397ADE016B26AB@shsmsx102.ccr.corp.intel.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andy Lutomirski , "Ren, Qiaowei" Cc: "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , X86 ML , "linux-kernel@vger.kernel.org" , Linux MM On 06/25/2014 02:05 PM, Andy Lutomirski wrote: > Hmm. the memfd_create thing may be able to do this for you. If you > created a per-mm memfd and mapped it, it all just might work. memfd_create() seems to bring a fair amount of baggage along (the fd part :) if all we want is a marker. Really, all we need is _a_ bit, and some way to plumb to userspace the RSS values of VMAs with that bit set. Creating and mmap()'ing a fd seems a rather roundabout way to get there. -- 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