From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752404AbbCWNnY (ORCPT ); Mon, 23 Mar 2015 09:43:24 -0400 Received: from smtprelay0116.hostedemail.com ([216.40.44.116]:49708 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752214AbbCWNnW (ORCPT ); Mon, 23 Mar 2015 09:43:22 -0400 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Spam-Summary: 2,0,0,,d41d8cd98f00b204,rostedt@goodmis.org,:::::::::::::::::::::,RULES_HIT:41:355:379:541:599:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1437:1515:1516:1518:1534:1539:1593:1594:1711:1730:1747:1777:1792:2393:2553:2559:2562:3138:3139:3140:3141:3142:3352:3622:3865:3866:3867:3868:3870:3871:3872:4250:5007:6261:7875:10004:10400:10848:10967:11232:11658:11914:12517:12519:12663:12740:13069:13311:13357:13868:14096:14097:21063:21080,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0 X-HE-Tag: shock18_1d052cbbe5349 X-Filterd-Recvd-Size: 2215 Date: Mon, 23 Mar 2015 09:43:17 -0400 From: Steven Rostedt To: Ingo Molnar Cc: Petr Mladek , Masami Hiramatsu , "David S. Miller" , Anil S Keshavamurthy , Ananth NMavinakayanahalli , Frederic Weisbecker , Ingo Molnar , Jiri Kosina , linux-kernel@vger.kernel.org, "Paul E. McKenney" Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails Message-ID: <20150323094317.38dcb601@gandalf.local.home> In-Reply-To: <20150323133442.GC23145@gmail.com> References: <1426860127-7896-1-git-send-email-pmladek@suse.cz> <20150323085426.GB28965@gmail.com> <20150323101253.GN11869@pathway.suse.cz> <20150323103327.GA12213@gmail.com> <20150323123955.GE15177@pathway.suse.cz> <20150323093013.15b6070b@gandalf.local.home> <20150323133442.GC23145@gmail.com> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; 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 Mon, 23 Mar 2015 14:34:42 +0100 Ingo Molnar wrote: > > Even if it was documented (it isn't), it's pretty weird terminology - > please use clearer formulations, like 'patched function' or 'unpatched > function' or 'function with pending patch'. No need to redefine > existing words in a weird fashion just to create the appearance of > being special ... > I think it has to do with their RCU like patching functionality, where some tasks are still executing the old function and others are executing the new function. In RCU, there's two "universes" too. One with the old value, and one with the new. After the grace period has finished, everything is back to a single "universe". I'm not sure RCU uses the term "universe" though. Paul? -- Steve