Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754372AbZFWTkk (ORCPT ); Tue, 23 Jun 2009 15:40:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752674AbZFWTkc (ORCPT ); Tue, 23 Jun 2009 15:40:32 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:33006 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752411AbZFWTkc (ORCPT ); Tue, 23 Jun 2009 15:40:32 -0400 Date: Tue, 23 Jun 2009 21:40:09 +0200 From: Ingo Molnar To: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli , lkml , "H. Peter Anvin" , Frederic Weisbecker , Jim Keniston , Srikar Dronamraju , Christoph Hellwig , Steven Rostedt , Anders Kaseorg , Tim Abbott , systemtap , DLE Subject: Re: [RFC][ PATCH -tip v2 0/7] kprobes: Kprobes jump optimization support Message-ID: <20090623194009.GA8777@elte.hu> References: <20090622212255.5384.53732.stgit@localhost.localdomain> <20090623114252.GB9497@elte.hu> <4A40E153.9030704@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A40E153.9030704@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) 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: 922 Lines: 27 * Masami Hiramatsu wrote: > Ingo Molnar wrote: > > * Masami Hiramatsu wrote: > > > >> o Usage > >> Set CONFIG_OPTPROBES=y when building a kernel, then all *probes will be > >> optimized if possible. > > > > Should be default-y if KPROBES is enabled. I.e. we really only want > > to disable it to debug potential issues. > > Sure, thanks! Plus i'd suggest a runtime control (a sysctl) as well - if it's not too intrusive. Since this is an optional speedup feature, distros can have this enabled and if there's some problem with it then it can still be disabled in sysctl.conf, without having to rebuild the kernel. 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/