Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754404AbdDMQae (ORCPT ); Thu, 13 Apr 2017 12:30:34 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:55478 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751193AbdDMQab (ORCPT ); Thu, 13 Apr 2017 12:30:31 -0400 Date: Thu, 13 Apr 2017 09:30:24 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu 37/40] srcu: Create a tiny SRCU Reply-To: paulmck@linux.vnet.ibm.com References: <20170412174003.GA23207@linux.vnet.ibm.com> <1492018825-25634-37-git-send-email-paulmck@linux.vnet.ibm.com> <20170413094830.tcmya7qer3kpific@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170413094830.tcmya7qer3kpific@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 17041316-0008-0000-0000-000001F40561 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006929; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00847060; UDB=6.00417882; IPR=6.00625494; BA=6.00005288; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015033; XFM=3.00000013; UTC=2017-04-13 16:30:28 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17041316-0009-0000-0000-0000349E8D2E Message-Id: <20170413163024.GE3956@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-13_11:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704130139 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 637 Lines: 22 On Thu, Apr 13, 2017 at 11:48:30AM +0200, Peter Zijlstra wrote: > On Wed, Apr 12, 2017 at 10:40:22AM -0700, Paul E. McKenney wrote: > > In response to automated complaints about modifications to SRCU > > increasing its size, this commit creates a tiny SRCU that is > > used in SMP=y && PREEMPT=n builds. > > You mean SMP=n && PREEMPT=n, right? I do, thank you for spotting this! Fixed. Thanx, Paul > config TINY_RCU > bool > default y if !PREEMPT && !SMP > > > +config TINY_SRCU > > + bool > > + default y if TINY_RCU > > + help > > + This option selects the single-CPU non-preemptible version of SRCU. >