Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755337Ab0BAQAM (ORCPT ); Mon, 1 Feb 2010 11:00:12 -0500 Received: from mail.gmx.net ([213.165.64.20]:38973 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754510Ab0BAQAK (ORCPT ); Mon, 1 Feb 2010 11:00:10 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+58nxpUm25atD4iUajj4Kw3EdP2OVH2nrQFH+FnT WP1rXeLXIOtiw4 Subject: Re: [patch 2/3] scheduler: add full memory barriers upon task switch at runqueue lock/unlock From: Mike Galbraith To: rostedt@goodmis.org Cc: Nick Piggin , Mathieu Desnoyers , Peter Zijlstra , Linus Torvalds , akpm@linux-foundation.org, Ingo Molnar , linux-kernel@vger.kernel.org, KOSAKI Motohiro , "Paul E. McKenney" , Nicholas Miell , laijs@cn.fujitsu.com, dipankar@in.ibm.com, josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, Valdis.Kletnieks@vt.edu, dhowells@redhat.com In-Reply-To: <1265037815.29013.0.camel@gandalf.stny.rr.com> References: <20100131205254.407214951@polymtl.ca> <20100131210013.446503342@polymtl.ca> <20100201073341.GH9085@laptop> <1265017350.24455.122.camel@laptop> <20100201101142.GE12759@laptop> <1265020561.24455.142.camel@laptop> <20100201104901.GH12759@laptop> <20100201144759.GD10894@Krystal> <20100201145831.GB19520@laptop> <1265037815.29013.0.camel@gandalf.stny.rr.com> Content-Type: text/plain Date: Mon, 01 Feb 2010 17:00:00 +0100 Message-Id: <1265040000.6312.21.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.67000000000000004 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 595 Lines: 19 On Mon, 2010-02-01 at 10:23 -0500, Steven Rostedt wrote: > On Tue, 2010-02-02 at 01:58 +1100, Nick Piggin wrote: > > So I would prefer the simpler version that doesn't add overhead to > > ctxsw, at least for the first implementation. > > Acked-by: Steven Rostedt > > ;-) Yup, fast path needs to _lose_ some weight. -Mike -- 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/