Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755796AbbBLMmF (ORCPT ); Thu, 12 Feb 2015 07:42:05 -0500 Received: from cantor2.suse.de ([195.135.220.15]:60167 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755372AbbBLMmD (ORCPT ); Thu, 12 Feb 2015 07:42:03 -0500 Date: Thu, 12 Feb 2015 13:42:01 +0100 (CET) From: Jiri Kosina To: Peter Zijlstra cc: Josh Poimboeuf , Ingo Molnar , Masami Hiramatsu , live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, Seth Jennings , Vojtech Pavlik Subject: Re: [RFC PATCH 6/9] livepatch: create per-task consistency model In-Reply-To: <20150212123906.GC23367@worktop.ger.corp.intel.com> Message-ID: References: <2c3d1e685dae5cccc2dfdb1b24c241b2f1c89348.1423499826.git.jpoimboe@redhat.com> <20150212032121.GA18578@treble.redhat.com> <20150212115628.GL2896@worktop.programming.kicks-ass.net> <20150212123906.GC23367@worktop.ger.corp.intel.com> User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1050 Lines: 31 On Thu, 12 Feb 2015, Peter Zijlstra wrote: > > Well, the fact indisputable fact is that there is a demand for this. It's > > not about one machine, it's about scheduling dowtimes of datacentres. > > The changelog says: > > > ... A patch can remain in the > > transition state indefinitely, if any of the tasks are stuck in the > > previous universe. > > Therefore there is no scheduling anything. Without timeliness guarantees > you can't make a schedule. > > Might as well just reboot, at least that's fairly well guaranteed to > happen. All running (reasonably alive) tasks will be running patched code though. You can't just claim complete victory (and get ready for accepting another patch, etc) if there is a long-time sleeper that hasn't been converted yet. -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/