From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993109AbXCIKgS (ORCPT ); Fri, 9 Mar 2007 05:36:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2993110AbXCIKgS (ORCPT ); Fri, 9 Mar 2007 05:36:18 -0500 Received: from depni.sinp.msu.ru ([213.131.7.21]:51055 "EHLO depni.sinp.msu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993109AbXCIKgR (ORCPT ); Fri, 9 Mar 2007 05:36:17 -0500 To: William Lee Irwin III Cc: Matt Mackall , Con Kolivas , linux-kernel , akpm@linux-foundation.org Subject: Re: 2.6.21-rc3-mm1 RSDL results References: <20070309053931.GA10459@waste.org> <200703091728.03978.kernel@kolivas.org> <20070309075358.GA10394@waste.org> <200703091936.47128.kernel@kolivas.org> <87slce945h.fsf@depni.sinp.msu.ru> <20070309094904.GC2986@holomorphy.com> From: Serge Belyshev Date: Fri, 09 Mar 2007 13:36:15 +0300 In-Reply-To: <20070309094904.GC2986@holomorphy.com> (William Lee Irwin, III's message of "Fri\, 9 Mar 2007 01\:49\:04 -0800") Message-ID: <87irdasnz4.fsf@depni.sinp.msu.ru> User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/23.0.0 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org William Lee Irwin III writes: > On Fri, Mar 09, 2007 at 12:07:06PM +0300, Serge Belyshev wrote: >> If you see sched_yield() when stracing any 3d program, I suggest you >> to try this bruteforce workaround, which works fine for me, >> disable sched_yield(): > > May I suggest LD_PRELOAD of a library consisting of only a nopped > sched_yield() function in userspace? > Sure. This is definitely clearer way to do. You just need to put export LD_PRELOAD=/path/to/your/lib.so somewhere early enough. cat > yield.c << EOF int sched_yield (void) { return 0; } EOF gcc yield.c -o yield.so -shared -O2 -fPIC -g