From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759574AbZEFMJp (ORCPT ); Wed, 6 May 2009 08:09:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758273AbZEFMJg (ORCPT ); Wed, 6 May 2009 08:09:36 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:57461 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758249AbZEFMJf (ORCPT ); Wed, 6 May 2009 08:09:35 -0400 Date: Wed, 6 May 2009 14:09:09 +0200 From: Ingo Molnar To: David Howells , Andrew Morton Cc: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, niv@us.ibm.com, dvhltc@us.ibm.com, lethal@linux-sh.org, kernel@wantstofly.org, matthew@wil.cx Subject: Re: [PATCH] v4 RCU: the bloatwatch edition Message-ID: <20090506120909.GR25203@elte.hu> References: <20090502163423.GA1633@linux.vnet.ibm.com> <12234.1241558327@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <12234.1241558327@redhat.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=3.2.5 -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 * David Howells wrote: > Paul E. McKenney wrote: > > > This patch is a version of RCU designed for (!SMP && EMBEDDED) > > 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 rcutorture testing in each > > of the four relevant configurations (combinations of NO_HZ and PREEMPT) > > on x86. This saves about 900 bytes compared to Classic RCU, and a > > couple kilobytes compared to Hierarchical RCU (updated to 2.6.29): > > ... > > Signed-off-by: Paul E. McKenney > > Acked-by: David Howells i'm wondering what Andrew thinks - he had objections, right? Ingo