Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754005AbbBTKCl (ORCPT ); Fri, 20 Feb 2015 05:02:41 -0500 Received: from cantor2.suse.de ([195.135.220.15]:45985 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753823AbbBTKCj (ORCPT ); Fri, 20 Feb 2015 05:02:39 -0500 Date: Fri, 20 Feb 2015 11:02:36 +0100 (CET) From: Jiri Kosina To: Ingo Molnar cc: Josh Poimboeuf , Vojtech Pavlik , Peter Zijlstra , Andrew Morton , Ingo Molnar , Seth Jennings , linux-kernel@vger.kernel.org, Linus Torvalds Subject: Re: [PATCH 1/3] sched: add sched_task_call() In-Reply-To: <20150220095003.GA23506@gmail.com> Message-ID: References: <20150219101607.GG5029@twins.programming.kicks-ass.net> <20150219162429.GA15980@treble.redhat.com> <20150219163359.GA25438@suse.cz> <20150219170353.GB15980@treble.redhat.com> <20150219171929.GA13178@suse.cz> <20150219173255.GC15980@treble.redhat.com> <20150219204036.GA16882@suse.com> <20150219214229.GD15980@treble.redhat.com> <20150220095003.GA23506@gmail.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: 1280 Lines: 30 On Fri, 20 Feb 2015, Ingo Molnar wrote: > So if your design is based on being able to discover 'live' functions in > the kernel stack dump of all tasks in the system, I think you need a > serious reboot of the whole approach and get rid of that fragility > before any of that functionality gets upstream! So let me repeat again, just to make sure that no more confusion is being spread around -- there are aproaches which do rely on stack contents, and aproaches which don't. kpatch (the Red Hat solution) and ksplice (the Oracle solution) contains stack analysis as a conceptual design step, kgraft (the SUSE solution) doesn't. Also the limited (in features -- consistency models) common infrastructure that is currently upstream doesn't care about stack contents. We are now figuring out which consistency models make sense for upstream, and how they can be achieved. Josh's patchset is one of the aproaches that is currently being discussed, but it's not the only available option. Thanks, -- 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/