Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932124AbWIOSZE (ORCPT ); Fri, 15 Sep 2006 14:25:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932143AbWIOSZE (ORCPT ); Fri, 15 Sep 2006 14:25:04 -0400 Received: from mx1.redhat.com ([66.187.233.31]:6832 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S932124AbWIOSZC (ORCPT ); Fri, 15 Sep 2006 14:25:02 -0400 Date: Fri, 15 Sep 2006 14:24:28 -0400 From: "Frank Ch. Eigler" To: Alan Cox Cc: karim@opersys.com, Roman Zippel , Tim Bird , Ingo Molnar , Mathieu Desnoyers , linux-kernel@vger.kernel.org, Christoph Hellwig , Andrew Morton , Ingo Molnar , Greg Kroah-Hartman , Thomas Gleixner , Tom Zanussi , ltt-dev@shafik.org, Michel Dagenais Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108 Message-ID: <20060915182428.GI4577@redhat.com> References: <1158323938.29932.23.camel@localhost.localdomain> <1158327696.29932.29.camel@localhost.localdomain> <1158331277.29932.66.camel@localhost.localdomain> <450ABA2A.9060406@opersys.com> <1158332324.29932.82.camel@localhost.localdomain> <1158345108.29932.120.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="yrj/dFKFPuw6o+aM" Content-Disposition: inline In-Reply-To: <1158345108.29932.120.camel@localhost.localdomain> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1396 Lines: 45 --yrj/dFKFPuw6o+aM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi - On Fri, Sep 15, 2006 at 07:31:48PM +0100, Alan Cox wrote: > Ar Gwe, 2006-09-15 am 13:08 -0400, ysgrifennodd Frank Ch. Eigler: Yeah, or something. :-) > > Alan Cox writes: > > - where 1000-cycle int3-dispatching overheads too high >=20 > Why are your despatching overheads 1000 cycles ? (and if its due to int3 > why are you using int 3 8)) Smart teams from IBM and Hitachi have been hammering away at this code for a year or two now, and yet (roughly) here we are. There have been experiments involving plopping branches instead of int3's at probe locations, but this is self-modifying code involving multiple instructions, and appears to be tricky on SMP/preempt boxes. - FChE --yrj/dFKFPuw6o+aM Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFFCu/cVZbdDOm/ZT0RAjCcAJ9YUWyw2EKQj0lPiE/PeIzPYLt2owCcDRO7 bDRstmo9RrHGBkvnyk8x0HU= =QuLZ -----END PGP SIGNATURE----- --yrj/dFKFPuw6o+aM-- - 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/