From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754623Ab1HEUsj (ORCPT ); Fri, 5 Aug 2011 16:48:39 -0400 Received: from terminus.zytor.com ([198.137.202.10]:46844 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751502Ab1HEUsj (ORCPT ); Fri, 5 Aug 2011 16:48:39 -0400 Message-ID: <4E3C571C.1070903@zytor.com> Date: Fri, 05 Aug 2011 13:48:28 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20110707 Thunderbird/5.0 MIME-Version: 1.0 To: Andrew Lutomirski CC: Andi Kleen , x86@kernel.org, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, lueckintel@yahoo.com, kimwooyoung@gmail.com Subject: Re: New vsyscall emulation breaks JITs References: <20110805200945.GA14014@tassilo.jf.intel.com> <4E3C5154.2050307@zytor.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/05/2011 01:45 PM, Andrew Lutomirski wrote: > > hpa: time is supported (as of 3.0) by the vdso, and very new glibc > uses the vdso version. We could add a native time implementation back > to the vsyscall page without too much pain as a short-term fix, but > that would be less than ideal. > How new does glibc have to be? How much of a pain would it be to make the legacy vs emulated vsyscall page a config option? -hpa