Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752816AbaAZI3G (ORCPT ); Sun, 26 Jan 2014 03:29:06 -0500 Received: from mga02.intel.com ([134.134.136.20]:30901 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752484AbaAZI3E (ORCPT ); Sun, 26 Jan 2014 03:29:04 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,723,1384329600"; d="scan'208";a="444712296" Message-ID: <52E4C5F2.8070707@intel.com> Date: Sun, 26 Jan 2014 16:23:14 +0800 From: Ren Qiaowei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.1 MIME-Version: 1.0 To: Ingo Molnar CC: "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: [PATCH v3 3/4] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE References: <1390727338-20487-1-git-send-email-qiaowei.ren@intel.com> <1390727338-20487-4-git-send-email-qiaowei.ren@intel.com> <20140126082201.GB28831@gmail.com> In-Reply-To: <20140126082201.GB28831@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/26/2014 04:22 PM, Ingo Molnar wrote: > > * Qiaowei Ren wrote: > >> This patch adds the PR_MPX_INIT and PR_MPX_RELEASE prctl() >> commands on the x86 platform. These commands can be used to >> init and release MPX related resource. >> >> A MMU notifier will be registered during PR_MPX_INIT >> command execution. So the bound tables can be automatically >> deallocated when one memory area is unmapped. >> >> Signed-off-by: Qiaowei Ren >> --- >> arch/x86/Kconfig | 4 ++ >> arch/x86/include/asm/mpx.h | 9 ++++ >> arch/x86/include/asm/processor.h | 16 +++++++ >> arch/x86/kernel/mpx.c | 84 ++++++++++++++++++++++++++++++++++++++ >> include/uapi/linux/prctl.h | 6 +++ >> kernel/sys.c | 12 +++++ >> 6 files changed, 131 insertions(+), 0 deletions(-) > > Hm. What is the expected typical frequency of these syscalls for a > larger application like a web browser? Only once per startup > typically, or will they be called more frequently? > It will be only once per startup. Thanks, Qiaowei -- 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/