Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754617AbZCVMi3 (ORCPT ); Sun, 22 Mar 2009 08:38:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753946AbZCVMiT (ORCPT ); Sun, 22 Mar 2009 08:38:19 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:38066 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753799AbZCVMiS (ORCPT ); Sun, 22 Mar 2009 08:38:18 -0400 Date: Sun, 22 Mar 2009 13:37:49 +0100 From: Ingo Molnar To: Linus Torvalds Cc: "Frank Ch. Eigler" , Andrew Morton , Roland McGrath , Steven Rostedt , utrace-devel@redhat.com, linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Oleg Nesterov , Alexey Dobriyan Subject: Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2 Message-ID: <20090322123749.GF19826@elte.hu> References: <20090321074301.GA19384@elte.hu> <20090321013912.ed6039c9.akpm@linux-foundation.org> <20090321091235.GA29678@elte.hu> <20090321041954.72b99e69.akpm@linux-foundation.org> <20090321115141.GA3566@redhat.com> <20090321050422.d1d99eec.akpm@linux-foundation.org> <20090321154501.GA2707@elte.hu> <20090321143413.75ead1aa.akpm@linux-foundation.org> <20090321215145.GB5262@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2155 Lines: 56 * Linus Torvalds wrote: > On Sat, 21 Mar 2009, Frank Ch. Eigler wrote: > > > > > If testing utrace against its main application requires installation > > > of a complete enterprise distro from a distro [...] > > > > This has *never* been a requirement. > > You guys are getting off a tangent. > > Let's go back to the post that started this all. > > > The thing is, utrace crashes in Fedora have dominated kerneloops.org > > for many months, so i'm not sure what to make of the idea of posting > > a 4000+ lines of core kernel code patchset on the last day of the > > development cycle, a posting that has carefully avoided the Cc:-ing > > of affected maintainers ;-) > > .. and dammit, I agree 100%. If utrace really shows up in _any_ > way on kerneloops.org, then I think THE ENTIRE DISCUSSION in this > thread is moot. > > I'm not going to take known-bad crap. It's that simple. Don't > bother posting it, don't bother discussing it, don't bother making > excuses for it. The kerneloops stats on utrace crashes are way down currently, after that peak last fall. So i didnt want to suggest that it's known-broken now - i only wanted to point out that it's a known-risky area and that the submission of it should involve the affected maintainers/developers. Regarding current stability, Roland, Frank, is the utrace patch in latest (today's) Fedora rawhide: -rw-r--r-- 1 root root 176555 2009-01-08 05:42 linux-2.6-utrace.patch a bug fixed equivalent of the utrace bits that crashed in the 2.6.26.3 kernel? In that case it is certainly known-good. Or is it a slimmed-down version? The ptrace bits and signoffs from Oleg and Alexey would certainly help (me) in trusting it. (I've Cc:-ed Oleg and Alexey) The ftrace bits could certainly be staged to go in via the tracing tree (in .31 or so) after the utrace-core+ptrace bits went upstream. Ingo -- 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/