From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757245AbZEEVUc (ORCPT ); Tue, 5 May 2009 17:20:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752149AbZEEVUW (ORCPT ); Tue, 5 May 2009 17:20:22 -0400 Received: from mx2.redhat.com ([66.187.237.31]:36251 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751808AbZEEVUW (ORCPT ); Tue, 5 May 2009 17:20:22 -0400 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20090502163423.GA1633@linux.vnet.ibm.com> References: <20090502163423.GA1633@linux.vnet.ibm.com> To: paulmck@linux.vnet.ibm.com Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@linux-foundation.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 Date: Tue, 05 May 2009 22:18:47 +0100 Message-ID: <12234.1241558327@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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