Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752391AbZKSNTr (ORCPT ); Thu, 19 Nov 2009 08:19:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752490AbZKSNTr (ORCPT ); Thu, 19 Nov 2009 08:19:47 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:56038 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752293AbZKSNTq convert rfc822-to-8bit (ORCPT ); Thu, 19 Nov 2009 08:19:46 -0500 Subject: Re: yield() in i2c non-happy paths hits BUG under -rt patch From: Peter Zijlstra To: Thomas Gleixner Cc: Jean Delvare , Leon Woestenberg , Alan Cox , Mark Brown , Sven-Thorsten Dietrich , linux-i2c@vger.kernel.org, rt-users , "Ben Dooks (embedded platforms)" , LKML In-Reply-To: References: <20091107210147.3e754278@hyperion.delvare> <4AF7148C.9090706@thebigcorporation.com> <20091112211255.09cd884a@hyperion.delvare> <20091116155606.GC29479@sirena.org.uk> <20091118010520.4cd397d4@lxorguk.ukuu.org.uk> <20091118175202.490989d8@hyperion.delvare> <20091119130526.23a69b85@hyperion.delvare> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Thu, 19 Nov 2009 14:21:12 +0100 Message-ID: <1258636872.4372.354.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 530 Lines: 15 On Thu, 2009-11-19 at 14:11 +0100, Thomas Gleixner wrote: > > You say "NOOP by default", does this imply there is a way to change > > this? > > There is a sysctl: sysctl_sched_compat_yield This makes yield() place current behind all other tasks, and sucks too for some workloads. -- 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/