Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751082AbWISTqJ (ORCPT ); Tue, 19 Sep 2006 15:46:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752006AbWISTqJ (ORCPT ); Tue, 19 Sep 2006 15:46:09 -0400 Received: from mx1.redhat.com ([66.187.233.31]:28088 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1751082AbWISTqH (ORCPT ); Tue, 19 Sep 2006 15:46:07 -0400 Date: Tue, 19 Sep 2006 15:45:15 -0400 From: "Frank Ch. Eigler" To: Mathieu Desnoyers Cc: linux-kernel@vger.kernel.org, Christoph Hellwig , Andrew Morton , Ingo Molnar , Greg Kroah-Hartman , Thomas Gleixner , Douglas Niehaus , Tom Zanussi , Paul Mundt , Jes Sorensen , Richard J Moore , William Cohen , "Martin J. Bligh" , Michel Dagenais , systemtap@sources.redhat.com, ltt-dev@shafik.org Subject: Re: [PATCH] Linux Kernel Markers 0.2 for Linux 2.6.17 Message-ID: <20060919194515.GB18646@redhat.com> References: <20060919183447.GA16095@Krystal> <20060919193623.GA9459@Krystal> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Fba/0zbH8Xs+Fj9o" Content-Disposition: inline In-Reply-To: <20060919193623.GA9459@Krystal> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1489 Lines: 46 --Fba/0zbH8Xs+Fj9o Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi - On Tue, Sep 19, 2006 at 03:36:24PM -0400, Mathieu Desnoyers wrote: > [...] > > If you don't allow yourself to presume on-the-fly function > > recompilation, then these markers would need to be made run-time > > rather than compile-time configurable. That is, not like this: > > [...] > By making them run-time configurable, I don't see any whay not to bloat the > kernel. How can be embed calls to printk+function+kprobe+djprobe without > having some kind of performance impact ? In order to have what we appear to need, we cannot avoid having some impact. (Even NOPs have impact.) Suppose that mbligh's clever but speculative idea has some nasty flaw, once someone tried to reduce it to code. Do you see that markers along the lines you've posted would be unsatisfactory? With that in mind, is there point adding such markers now? - FChE --Fba/0zbH8Xs+Fj9o Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFFEEjLVZbdDOm/ZT0RAhd3AJ0Rqu08opLvHdPQtnzUBBAwFlTcEQCdFPj9 hUggBYuqRXZ5Ito8qf83eEM= =in9L -----END PGP SIGNATURE----- --Fba/0zbH8Xs+Fj9o-- - 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/