From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759823AbZFWQkq (ORCPT ); Tue, 23 Jun 2009 12:40:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751248AbZFWQkj (ORCPT ); Tue, 23 Jun 2009 12:40:39 -0400 Received: from 124x34x33x190.ap124.ftth.ucom.ne.jp ([124.34.33.190]:43483 "EHLO master.linux-sh.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750845AbZFWQki (ORCPT ); Tue, 23 Jun 2009 12:40:38 -0400 Date: Wed, 24 Jun 2009 01:39:40 +0900 From: Paul Mundt To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@linux-foundation.org, niv@us.ibm.com, dvhltc@us.ibm.com, dhowells@redhat.com, kernel@wantstofly.org, matthew@wil.cx Subject: Re: [PATCH -tip] v5 RCU: the bloatwatch edition Message-ID: <20090623163939.GE26674@linux-sh.org> Mail-Followup-To: Paul Mundt , "Paul E. McKenney" , linux-kernel@vger.kernel.org, mingo@elte.hu, akpm@linux-foundation.org, niv@us.ibm.com, dvhltc@us.ibm.com, dhowells@redhat.com, kernel@wantstofly.org, matthew@wil.cx References: <20090623042442.GA15630@linux.vnet.ibm.com> <20090623161217.GA15298@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090623161217.GA15298@linux.vnet.ibm.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 23, 2009 at 09:12:17AM -0700, Paul E. McKenney wrote: > This patch is a -tip 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 1263 bytes compared to Classic RCU, and more than > three kilobytes compared to Hierarchical RCU (updated to 2.6.30): > [snip] > Signed-off-by: Paul E. McKenney > Acked-by: David Howells Acked-by: Paul Mundt