From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751458AbdGZXJl (ORCPT ); Wed, 26 Jul 2017 19:09:41 -0400 Received: from smtprelay0142.hostedemail.com ([216.40.44.142]:56567 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751078AbdGZXJk (ORCPT ); Wed, 26 Jul 2017 19:09:40 -0400 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::::::::::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1537:1566:1593:1594:1711:1714:1730:1747:1777:1792:2393:2553:2559:2562:3138:3139:3140:3141:3142:3622:3865:3866:3867:3870:3871:3872:3874:4321:5007:6261:6742:7875:8957:10004:10400:10848:10967:11232:11658:11914:12296:12740:12760:12895:13069:13255:13311:13357:13439:14181:14659:14721:21080:21627:30054:30090:30091,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: neck96_5407c8a3d4e28 X-Filterd-Recvd-Size: 1772 Date: Wed, 26 Jul 2017 19:09:34 -0400 From: Steven Rostedt To: "Paul E. McKenney" 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, peterz@infradead.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com Subject: Re: [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB deferred wakeups Message-ID: <20170726190934.1807e761@vmware.local.home> In-Reply-To: <20170726214741.GD3730@linux.vnet.ibm.com> References: <20170724214425.GA9665@linux.vnet.ibm.com> <1500932684-10469-2-git-send-email-paulmck@linux.vnet.ibm.com> <20170725141220.4d2d968e@vmware.local.home> <20170725191814.GU3730@linux.vnet.ibm.com> <20170725181710.44cd1002@vmware.local.home> <20170726000540.GE3730@linux.vnet.ibm.com> <20170726171801.5da044c3@vmware.local.home> <20170726214741.GD3730@linux.vnet.ibm.com> X-Mailer: Claws Mail 3.15.0-dirty (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 26 Jul 2017 14:47:41 -0700 "Paul E. McKenney" wrote: > > It is much lighter weight than a timer setup. > > How much lighter weight? In other words, what fraction of the > timers have to avoid being cancelled for irq_work to break even? No idea. I guess that would be a nice academic exercise ;-) -- Steve