From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263370AbTJOPFm (ORCPT ); Wed, 15 Oct 2003 11:05:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263378AbTJOPFl (ORCPT ); Wed, 15 Oct 2003 11:05:41 -0400 Received: from dvmwest.gt.owl.de ([62.52.24.140]:16600 "EHLO dvmwest.gt.owl.de") by vger.kernel.org with ESMTP id S263370AbTJOPFb (ORCPT ); Wed, 15 Oct 2003 11:05:31 -0400 Date: Wed, 15 Oct 2003 17:05:30 +0200 From: Jan-Benedict Glaw To: linux-kernel@vger.kernel.org Subject: Re: Unbloating the kernel, action list Message-ID: <20031015150530.GJ20846@lug-owl.de> Mail-Followup-To: linux-kernel@vger.kernel.org References: <20031014214311.GC933@inwind.it> <16710000.1066170641@flay> <20031014155638.7db76874.cliffw@osdl.org> <20031015124842.GE20846@lug-owl.de> <20031015131015.GR16158@holomorphy.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="YGDJTm4HeavG21wE" Content-Disposition: inline In-Reply-To: <20031015131015.GR16158@holomorphy.com> X-Operating-System: Linux mail 2.4.18 X-gpg-fingerprint: 250D 3BCF 7127 0D8C A444 A961 1DBD 5E75 8399 E1BB X-gpg-key: wwwkeys.de.pgp.net User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --YGDJTm4HeavG21wE Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, 2003-10-15 06:10:15 -0700, William Lee Irwin III wrote in message <20031015131015.GR16158@holomorphy.com>: > On Wed, Oct 15, 2003 at 02:48:42PM +0200, Jan-Benedict Glaw wrote: > > I can put on the table: > > Unfortunately, you need an additional kernel patch because nearly all > > distros are using mach=3D=3Di486 which gives you nice sigills on an i386 > > otherwise... >=20 > Can you quantify the performance impact of cmov emulation (or whatever > it is)? I have a vague notion it could be hard given the daunting task > of switching userspace around to verify it. I can't. I'm haven't seen a really noticeable impact, but that doesn't tell much:) However, there's no other chance than emulating cmov and locked xchgs. If glibc/libstdc++ would go back, ABI would break and you couldn't any longer copy programs build within one distribution over to another. So I think I'll diff out the patch and send it for review (note: it was _not_ initially written by me!). MfG, JBG --=20 Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481 "Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg fuer einen Freien Staat voll Freier B=FCrger" | im Internet! | im Ira= k! ret =3D do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TC= PA)); --YGDJTm4HeavG21wE Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/jWI6Hb1edYOZ4bsRAs/0AJ98c0TjDvisIZq8jMcpqUFKZmD4uACffvVC wJzxdAFH7AshgPlfdajISBQ= =ZWf+ -----END PGP SIGNATURE----- --YGDJTm4HeavG21wE--