From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sun, 29 May 2011 22:17:49 +0200 (CEST) Received: from mx2.mail.elte.hu ([157.181.151.9]:53632 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S1491095Ab1E2URl (ORCPT ); Sun, 29 May 2011 22:17:41 +0200 Received: from elvis.elte.hu ([157.181.1.14]) by mx2.mail.elte.hu with esmtp (Exim) id 1QQmQN-000404-4K from ; Sun, 29 May 2011 22:17:29 +0200 Received: by elvis.elte.hu (Postfix, from userid 1004) id D204F3E252E; Sun, 29 May 2011 22:17:09 +0200 (CEST) Date: Sun, 29 May 2011 22:17:13 +0200 From: Ingo Molnar To: Peter Zijlstra Cc: Thomas Gleixner , Will Drewry , Steven Rostedt , Frederic Weisbecker , James Morris , linux-kernel@vger.kernel.org, Eric Paris , kees.cook@canonical.com, agl@chromium.org, "Serge E. Hallyn" , Ingo Molnar , Andrew Morton , Tejun Heo , Michal Marek , Oleg Nesterov , Jiri Slaby , David Howells , Russell King , Michal Simek , Ralf Baechle , Benjamin Herrenschmidt , Paul Mackerras , Martin Schwidefsky , Heiko Carstens , linux390@de.ibm.com, Paul Mundt , "David S. Miller" , "H. Peter Anvin" , x86@kernel.org, linux-arm-kernel , linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Linus Torvalds Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering Message-ID: <20110529201713.GA25789@elte.hu> References: <20110517131902.GF21441@elte.hu> <1305807728.11267.25.camel@gandalf.stny.rr.com> <1306254027.18455.47.camel@twins> <20110524195435.GC27634@elte.hu> <20110525150153.GE29179@elte.hu> <1306345402.21578.100.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1306345402.21578.100.camel@twins> User-Agent: Mutt/1.5.20 (2009-08-17) Received-SPF: neutral (mx2.mail.elte.hu: 157.181.1.14 is neither permitted nor denied by domain of elte.hu) client-ip=157.181.1.14; envelope-from=mingo@elte.hu; helo=elvis.elte.hu; X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 30171 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: mingo@elte.hu Precedence: bulk X-list: linux-mips * Peter Zijlstra wrote: > But face it, you can argue until you're blue in the face, That is not a technical argument though - and i considered and answered every valid technical argument made by you and Thomas. You were either not able to or not willing to counter them. > [...] but both tglx and I will NAK any and all patches that extend > perf/ftrace beyond the passive observing role. The thing is, perf is *already* well beyond the 'passive observer' role: we already generate lots of 'action' in response to events. We generate notification signals, we write events - all of which can (and does) modify program behavior. So what's your point? There's no "passive observer" role really - it's apparently just that you dislike this use of instrumentation while you approve of other uses. Thanks, Ingo From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.mail.elte.hu (mx2.mail.elte.hu [157.181.151.9]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 60CC1B6F7F for ; Mon, 30 May 2011 06:17:52 +1000 (EST) Date: Sun, 29 May 2011 22:17:13 +0200 From: Ingo Molnar To: Peter Zijlstra Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering Message-ID: <20110529201713.GA25789@elte.hu> References: <20110517131902.GF21441@elte.hu> <1305807728.11267.25.camel@gandalf.stny.rr.com> <1306254027.18455.47.camel@twins> <20110524195435.GC27634@elte.hu> <20110525150153.GE29179@elte.hu> <1306345402.21578.100.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1306345402.21578.100.camel@twins> Cc: linux-mips@linux-mips.org, linux-sh@vger.kernel.org, Frederic Weisbecker , Heiko Carstens , Oleg Nesterov , David Howells , Paul Mackerras , Eric Paris , "H. Peter Anvin" , sparclinux@vger.kernel.org, Jiri Slaby , linux-s390@vger.kernel.org, Russell King , x86@kernel.org, James Morris , Linus Torvalds , Ingo Molnar , kees.cook@canonical.com, "Serge E. Hallyn" , Steven Rostedt , Martin Schwidefsky , Thomas Gleixner , linux-arm-kernel , Michal Marek , Michal Simek , Will Drewry , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Ralf Baechle , Paul Mundt , Tejun Heo , linux390@de.ibm.com, Andrew Morton , agl@chromium.org, "David S. Miller" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , * Peter Zijlstra wrote: > But face it, you can argue until you're blue in the face, That is not a technical argument though - and i considered and answered every valid technical argument made by you and Thomas. You were either not able to or not willing to counter them. > [...] but both tglx and I will NAK any and all patches that extend > perf/ftrace beyond the passive observing role. The thing is, perf is *already* well beyond the 'passive observer' role: we already generate lots of 'action' in response to events. We generate notification signals, we write events - all of which can (and does) modify program behavior. So what's your point? There's no "passive observer" role really - it's apparently just that you dislike this use of instrumentation while you approve of other uses. Thanks, Ingo From mboxrd@z Thu Jan 1 00:00:00 1970 From: mingo@elte.hu (Ingo Molnar) Date: Sun, 29 May 2011 22:17:13 +0200 Subject: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering In-Reply-To: <1306345402.21578.100.camel@twins> References: <20110517131902.GF21441@elte.hu> <1305807728.11267.25.camel@gandalf.stny.rr.com> <1306254027.18455.47.camel@twins> <20110524195435.GC27634@elte.hu> <20110525150153.GE29179@elte.hu> <1306345402.21578.100.camel@twins> Message-ID: <20110529201713.GA25789@elte.hu> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Peter Zijlstra wrote: > But face it, you can argue until you're blue in the face, That is not a technical argument though - and i considered and answered every valid technical argument made by you and Thomas. You were either not able to or not willing to counter them. > [...] but both tglx and I will NAK any and all patches that extend > perf/ftrace beyond the passive observing role. The thing is, perf is *already* well beyond the 'passive observer' role: we already generate lots of 'action' in response to events. We generate notification signals, we write events - all of which can (and does) modify program behavior. So what's your point? There's no "passive observer" role really - it's apparently just that you dislike this use of instrumentation while you approve of other uses. Thanks, Ingo