Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753835AbYHINCj (ORCPT ); Sat, 9 Aug 2008 09:02:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751946AbYHINCb (ORCPT ); Sat, 9 Aug 2008 09:02:31 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.124]:39951 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751941AbYHINCa (ORCPT ); Sat, 9 Aug 2008 09:02:30 -0400 Date: Sat, 9 Aug 2008 09:02:28 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Bodo Eggert <7eggert@gmx.de> cc: Andi Kleen , Mathieu Desnoyers , LKML , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Andrew Morton , Linus Torvalds , David Miller , Roland McGrath , Ulrich Drepper , Rusty Russell , Jeremy Fitzhardinge , Gregory Haskins , Arnaldo Carvalho de Melo , "Luis Claudio R. Goncalves" , Clark Williams Subject: Re: [PATCH 0/5] ftrace: to kill a daemon In-Reply-To: Message-ID: References: User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 966 Lines: 28 On Sat, 9 Aug 2008, Bodo Eggert wrote: > Steven Rostedt wrote: > > On Sat, 9 Aug 2008, Andi Kleen wrote: > >> Steven Rostedt writes: > > >> > I'm stubborn, I want to get it right _and_ keep it fast. > >> > >> For me it would seem better to just not use two part 5 byte nops > >> instead of adding such hacks. I doubt there are that many of them > >> anyways. I bet you won't be able to measure any difference between the > >> different nop types in any macro benchmark. > > > > I wish we had a true 5 byte nop. The alternative is a jmp 0, which is > > measurable. > > Did you try short jumps? (0xeb 0x03 0x?? 0x?? 0x??) What would those last three bytes be? -- Steve -- 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/