From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757385Ab1ETXRH (ORCPT ); Fri, 20 May 2011 19:17:07 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:36570 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756295Ab1ETXQx (ORCPT ); Fri, 20 May 2011 19:16:53 -0400 Message-ID: <4DD6F64C.3030402@kernel.org> Date: Fri, 20 May 2011 16:16:28 -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: linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, tglx@linutronix.de, mingo@elte.hu, linux-tip-commits@vger.kernel.org Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" References: <4DD6D746.6070107@kernel.org> <20110520224250.GL2366@linux.vnet.ibm.com> <4DD6F4A2.1070401@kernel.org> <20110520231428.GN2366@linux.vnet.ibm.com> In-Reply-To: <20110520231428.GN2366@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet21.oracle.com [141.146.126.237] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090202.4DD6F652.0026,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/20/2011 04:14 PM, Paul E. McKenney wrote: > On Fri, May 20, 2011 at 04:09:22PM -0700, Yinghai Lu wrote: >> On 05/20/2011 03:42 PM, Paul E. McKenney wrote: >>> On Fri, May 20, 2011 at 02:04:06PM -0700, Yinghai Lu wrote: >>>> On 05/19/2011 02:37 PM, tip-bot for Paul E. McKenney wrote: >>>>> Commit-ID: 80d02085d99039b3b7f3a73c8896226b0cb1ba07 >>>>> Gitweb: http://git.kernel.org/tip/80d02085d99039b3b7f3a73c8896226b0cb1ba07 >>>>> Author: Paul E. McKenney >>>>> AuthorDate: Thu, 12 May 2011 01:08:07 -0700 >>>>> Committer: Ingo Molnar >>>>> CommitDate: Thu, 19 May 2011 23:25:29 +0200 >>>>> >>>>> Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" >>>>> >>>>> This reverts commit e59fb3120becfb36b22ddb8bd27d065d3cdca499. >>>>> >>>>> This reversion was due to (extreme) boot-time slowdowns on SPARC seen by >>>>> Yinghai Lu and on x86 by Ingo >>>>> . >>>>> This is a non-trivial reversion due to intervening commits. >>>>> >>>>> Conflicts: >>>>> >>>>> Documentation/RCU/trace.txt >>>>> kernel/rcutree.c >>>>> >>>>> Signed-off-by: Ingo Molnar >>>>> --- >>>>> Documentation/RCU/trace.txt | 17 ++++-- >>>>> kernel/rcutree.c | 130 ++++++++++++++++++++++++------------------ >>>>> kernel/rcutree.h | 9 ++- >>>>> kernel/rcutree_plugin.h | 7 +- >>>>> kernel/rcutree_trace.c | 12 ++-- >>>>> 5 files changed, 102 insertions(+), 73 deletions(-) >>>>> >>>> >>>> current tip/master that have this reverting and without setting DEBUG_LOCKING_API_SELFTESTS >>>> >>>> still get delay >>>> >>>> [ 35.419453] cpu_dev_init done >>>> [ 128.981770] memory_dev_init done >>>> >>>> should take only 3 or 4 seconds. >>> >>> Thank you for checking this out. >>> >>> This is with the same configuration you sent earlier? (Other than the >>> DEBUG_LOCKING_API_SELFTESTS, of course.) >>> >> >> 8 socket westmere-ex. and compiled with gcc from opensuse 11.3. >> >> if compile kernel from fedora 14, there will be not delay. > > Thank you for the info. Could you please send me the .config files from > both builds? the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled. Thanks