From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932281Ab1ETVEt (ORCPT ); Fri, 20 May 2011 17:04:49 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:50766 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757459Ab1ETVEq (ORCPT ); Fri, 20 May 2011 17:04:46 -0400 Message-ID: <4DD6D746.6070107@kernel.org> Date: Fri, 20 May 2011 14:04:06 -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: linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, paulmck@linux.vnet.ibm.com, tglx@linutronix.de, mingo@elte.hu CC: linux-tip-commits@vger.kernel.org Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof" References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Source-IP: rtcsinet21.oracle.com [66.248.204.29] X-CT-RefId: str=0001.0A090206.4DD6D751.010F,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Thanks Yinghai