From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755464Ab3GKCV7 (ORCPT ); Wed, 10 Jul 2013 22:21:59 -0400 Received: from mail7.hitachi.co.jp ([133.145.228.42]:37848 "EHLO mail7.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755063Ab3GKCV5 (ORCPT ); Wed, 10 Jul 2013 22:21:57 -0400 Message-ID: <51DE16C1.4030403@hitachi.com> Date: Thu, 11 Jul 2013 11:21:53 +0900 From: Masami Hiramatsu Organization: Hitachi, Ltd., Japan User-Agent: Mozilla/5.0 (Windows NT 5.2; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: Jiri Kosina Cc: Steven Rostedt , Jason Baron , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: [RFC] [PATCH 0/2] x86: make jump labels use int3-based breakpoint instead of stop_machine() References: 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 (2013/07/11 5:25), Jiri Kosina wrote: > Hi, > > this is a resurrection of a few years old idea to have jump labels use > synchronization based on int3 breakpoint rather than relying on > stop_machine() with all the consequences. > > ftrace has been doing exactly this kind of patching for year since > 08d636b6 ("ftrace/x86: Have arch x86_64 use breakpoints instead of stop > machine"). > > This patchset first introduces generic text_poke_bp() that provides means > to perform this method of patching in parallel to text_poke_smp(), and > then converts x86 jump label code to use it. > > If this is merged, I'll do a followup patch converting ftrace to use this > infrastructure as well, as it's doing the same thing in principle already. Hi Jiri, Thank you for taking over it! :) If yours is merged, I can move optprobe on that too ;) Thank you again!! -- Masami HIRAMATSU IT Management Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com