From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422889AbdD0Uqk (ORCPT ); Thu, 27 Apr 2017 16:46:40 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:42598 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S968917AbdD0Uq3 (ORCPT ); Thu, 27 Apr 2017 16:46:29 -0400 Date: Thu, 27 Apr 2017 13:46:26 -0700 From: "Paul E. McKenney" To: mingo@kernel.org Cc: linux-kernel@vger.kernel.org, efault@gmx.de Subject: [GIT PULL rcu/urgent] Adjust SRCU auto-expedite default delay Reply-To: paulmck@linux.vnet.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 17042720-0040-0000-0000-00000328C5DA X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006985; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00853327; UDB=6.00421914; IPR=6.00632197; BA=6.00005316; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015210; XFM=3.00000014; UTC=2017-04-27 20:46:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17042720-0041-0000-0000-0000071CE120 Message-Id: <20170427204626.GA21594@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-27_17:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1704270333 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Ingo, This series adds a small change to yesterday's pull request, namely changing the default value of the srcutree.exp_holdoff kernel boot parameter from 50 microseconds to 25 microseconds. This change completely eliminates the performance shortfall that Mike Galbraith observed. This commit is available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent for you to fetch changes up to b5fe223a4bd0217a657ff084e48752c367a8a55f: srcu: Adjust default auto-expediting holdoff (2017-04-27 08:35:24 -0700) ---------------------------------------------------------------- Paul E. McKenney (1): srcu: Adjust default auto-expediting holdoff kernel/rcu/srcutree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)