Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932776AbZJHRSa (ORCPT ); Thu, 8 Oct 2009 13:18:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759024AbZJHRSa (ORCPT ); Thu, 8 Oct 2009 13:18:30 -0400 Received: from tomts16.bellnexxia.net ([209.226.175.4]:55532 "EHLO tomts16-srv.bellnexxia.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758797AbZJHRS3 (ORCPT ); Thu, 8 Oct 2009 13:18:29 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtMEAF64zUpMROOX/2dsb2JhbACBUtlwhCoE Date: Thu, 8 Oct 2009 13:17:50 -0400 From: Mathieu Desnoyers To: Christoph Lameter Cc: Peter Zijlstra , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Pekka Enberg , Tejun Heo , Mel Gorman , mingo@elte.hu Subject: Re: [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/o interrupt disable Message-ID: <20091008171750.GA3370@Krystal> References: <20091007025440.GB4664@Krystal> <1254906707.26976.225.camel@twins> <20091007124628.GB27363@Krystal> <20091007150257.GA8508@Krystal> <20091007151940.GA10052@Krystal> <1254988350.26976.256.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: X-Editor: vi X-Info: http://krystal.dyndns.org:8080 X-Operating-System: Linux/2.6.27.31-grsec (i686) X-Uptime: 13:17:28 up 51 days, 4:06, 2 users, load average: 0.20, 0.18, 0.11 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 761 Lines: 25 * Christoph Lameter (cl@linux-foundation.org) wrote: > On Thu, 8 Oct 2009, Peter Zijlstra wrote: > > > > preempt_enable_no_sched() > > > > NACK, delaying the reschedule is not an option > > I ended up just doing a preempt_disable() at the beginning and a > preempt_disable() at the end. That should be easily reviewable. > Then how do you re-enable preemption in the slow path when you need to block ? Mathieu -- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- 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/