From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751618Ab1EOEPA (ORCPT ); Sun, 15 May 2011 00:15:00 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:52158 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751213Ab1EOEO7 (ORCPT ); Sun, 15 May 2011 00:14:59 -0400 Message-ID: <4DCF5322.7030305@kernel.org> Date: Sat, 14 May 2011 21:14:26 -0700 From: Yinghai Lu User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110414 SUSE/3.1.10 Thunderbird/3.1.10 MIME-Version: 1.0 To: paulmck@linux.vnet.ibm.com CC: Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [GIT PULL rcu/next] rcu commits for 2.6.40 References: <4DCAFFD8.2080605@kernel.org> <4DCB157F.20202@kernel.org> <20110512060344.GB3191@elte.hu> <4DCB8BCD.1080607@kernel.org> <4DCB8F7A.90603@kernel.org> <20110512092013.GJ2258@linux.vnet.ibm.com> <4DCC52FB.6030500@kernel.org> <20110514142621.GB2258@linux.vnet.ibm.com> <20110514153118.GA24311@linux.vnet.ibm.com> <20110514183453.GA32756@linux.vnet.ibm.com> In-Reply-To: <20110514183453.GA32756@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet22.oracle.com [141.146.126.238] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090208.4DCF532D.003B,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/14/2011 11:34 AM, Paul E. McKenney wrote: >> and do the inspection afterwards. > > And here is a lightly-tested patch, which applies on tip/core/rcu. > > This problem could account for both the long delays seen with e59fb312 > (Decrease memory-barrier usage based on semi-formal proof) and the > shorter delays seen with a26ac245 (move TREE_RCU from softirq to kthread). yes. it fixes the problem. for 1024g system when hotadd mem enabled in kernel config [ 31.814803] cpu_dev_init done [ 35.437163] memory_dev_init done even it is with gcc from opensuse 11.3 Thanks Yinghai