From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755669AbZANKlT (ORCPT ); Wed, 14 Jan 2009 05:41:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752293AbZANKlJ (ORCPT ); Wed, 14 Jan 2009 05:41:09 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:53736 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751486AbZANKlI (ORCPT ); Wed, 14 Jan 2009 05:41:08 -0500 Date: Wed, 14 Jan 2009 11:40:55 +0100 From: Ingo Molnar To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, niv@us.ibm.com, dvhltc@us.ibm.com Subject: Re: [PATCH fyi] RCU: the bloatwatch edition Message-ID: <20090114104055.GD2913@elte.hu> References: <20090113221724.GA15307@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090113221724.GA15307@linux.vnet.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Paul E. McKenney wrote: > Just FYI, not for inclusion. > > This patch is a version of RCU designed for !CONFIG_SMP provided as a > proof of concept of a small-footprint RCU implementation. In > particular, the implementation of synchronize_rcu() is extremely > lightweight and high performance. It passes moderate rcutorture testing > in each of the four relevant configurations (combinations of NO_HZ and > PREEMPT) on x86. > > Signed-off-by: Paul E. McKenney maybe it could be included - dependent on PREEMPT, just like we have SLOB? it would also be rather educative IMO: if someone wants to understand the core concepts of RCU, start with kernel/rcutiny.c. We are getting complaints from academic institutions that the Linux kernel is getting too complex to teach in courses - and that's a pity. Ingo