From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932515AbcHVPWi (ORCPT ); Mon, 22 Aug 2016 11:22:38 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56354 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932301AbcHVPWh (ORCPT ); Mon, 22 Aug 2016 11:22:37 -0400 X-IBM-Helo: d03dlp03.boulder.ibm.com X-IBM-MailFrom: paulmck@linux.vnet.ibm.com Date: Mon, 22 Aug 2016 08:22:39 -0700 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: [PATCH tip/core/rcu 0/2] Expedited grace-period updates 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-Content-Scanned: Fidelis XPS MAILER x-cbid: 16082215-0024-0000-0000-000014618E95 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00005629; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000183; SDB=6.00748116; UDB=6.00353034; IPR=6.00520781; BA=6.00004672; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00012420; XFM=3.00000011; UTC=2016-08-22 15:22:34 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16082215-0025-0000-0000-000043C7880A Message-Id: <20160822152239.GA7153@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-22_07:,, 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=8.0.1-1604210000 definitions=main-1608220159 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series contains updates and fixes to expedited grace-period handling: 1. Consolidate nearly identical code from synchronize_rcu_expedited() and synchronize_sched_expedited(). 2. Drive expedited grace periods from workqueue rather than user task. 3. Stop disabling expedited RCU CPU stall warnings, enabled by #2 above. 4. Make expedited RCU CPU stall warnings respond to the panic_on_rcu_stall sysctl setting and the rcupdate.rcu_cpu_stall_suppress kernel boot parameter. 5. Exclude RCU-offline CPUs from expedited grace periods based on RCU's internal state. 6. Use RCU's online-CPU state for expedited-grace-period IPI retry. Thanx, Paul ------------------------------------------------------------------------ tree.h | 1 tree_exp.h | 134 ++++++++++++++++++++++++++++++++++++----------------------- tree_trace.c | 7 +-- 3 files changed, 87 insertions(+), 55 deletions(-)