Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759450AbYHIAwa (ORCPT ); Fri, 8 Aug 2008 20:52:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752105AbYHIAwW (ORCPT ); Fri, 8 Aug 2008 20:52:22 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:44310 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751033AbYHIAwW (ORCPT ); Fri, 8 Aug 2008 20:52:22 -0400 Date: Fri, 8 Aug 2008 17:51:16 -0700 (PDT) From: Linus Torvalds To: Jeremy Fitzhardinge cc: Steven Rostedt , Andi Kleen , Mathieu Desnoyers , LKML , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Miller , Roland McGrath , Ulrich Drepper , Rusty Russell , 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: <489CE90D.1040902@goop.org> Message-ID: References: <20080807182013.984175558@goodmis.org> <20080807184741.GB18164@Krystal> <20080808172259.GB8244@Krystal> <20080808174607.GG8244@Krystal> <20080808182104.GA11376@Krystal> <20080808190506.GD11376@Krystal> <87tzdv2g05.fsf@basil.nowhere.org> <489CE90D.1040902@goop.org> User-Agent: Alpine 1.10 (LFD 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: 550 Lines: 20 On Fri, 8 Aug 2008, Jeremy Fitzhardinge wrote: > > Steven Rostedt wrote: > > I wish we had a true 5 byte nop. > > 0x66 0x66 0x66 0x66 0x90 I don't think so. Multiple redundant prefixes can be really expensive on some uarchs. A no-op that isn't cheap isn't a no-op at all, it's a slow-op. Linus -- 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/