Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751867AbWIRRyh (ORCPT ); Mon, 18 Sep 2006 13:54:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751868AbWIRRyh (ORCPT ); Mon, 18 Sep 2006 13:54:37 -0400 Received: from dvhart.com ([64.146.134.43]:16869 "EHLO dvhart.com") by vger.kernel.org with ESMTP id S1751867AbWIRRyh (ORCPT ); Mon, 18 Sep 2006 13:54:37 -0400 Message-ID: <450EDD5B.907@mbligh.org> Date: Mon, 18 Sep 2006 10:54:35 -0700 From: Martin Bligh User-Agent: Mozilla Thunderbird 1.0.7 (X11/20051011) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Alan Cox Cc: "Frank Ch. Eigler" , Ingo Molnar , Paul Mundt , Mathieu Desnoyers , linux-kernel , Jes Sorensen , Andrew Morton , Tom Zanussi , Richard J Moore , Michel Dagenais , Christoph Hellwig , Greg Kroah-Hartman , Thomas Gleixner , William Cohen Subject: Re: tracepoint maintainance models References: <20060918000703.GA22752@elte.hu> <450DF28E.3050101@opersys.com> <20060918011352.GB30835@elte.hu> <20060918122527.GC3951@redhat.com> <20060918150231.GA8197@elte.hu> <1158594491.6069.125.camel@localhost.localdomain> <20060918152230.GA12631@elte.hu> <1158596341.6069.130.camel@localhost.localdomain> <20060918161526.GL3951@redhat.com> <1158598927.6069.141.camel@localhost.localdomain> <20060918172705.GN3951@redhat.com> <1158602662.6069.147.camel@localhost.localdomain> In-Reply-To: <1158602662.6069.147.camel@localhost.localdomain> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1166 Lines: 28 Alan Cox wrote: > Ar Llu, 2006-09-18 am 13:27 -0400, ysgrifennodd Frank Ch. Eigler: > >>Unless one's worried about planetary-scale energy use, I see no point >>in multiplying overheads by "every box on the planet". > > > Because we are all paying for your debug stuff we aren't using. Systems > get slow and sucky by the death of a million cuts not by one stupid > action. Bear in mind that it could be CONFIG'ed out, so you can still do as you choose. But for many people, the ability to get insight into their application's interaction with the kernel and get several % performance improvement by understanding their environment will outweigh the 0.01% overhead of a few nops. IME, most performance problems are not little tiny instruction-cycle level things, they're huge sucking wounds that people just don't know how to fix, or that they even exist (such as "oops, I single-threaded all my IO from my app"). M. - 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/