Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765293AbZAQWfb (ORCPT ); Sat, 17 Jan 2009 17:35:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761620AbZAQWfI (ORCPT ); Sat, 17 Jan 2009 17:35:08 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:40551 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762196AbZAQWfG (ORCPT ); Sat, 17 Jan 2009 17:35:06 -0500 Date: Sat, 17 Jan 2009 23:34:51 +0100 From: Ingo Molnar To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Andrew Morton , Frederic Weisbecker , Chris Mason Subject: Re: [PATCH 0/2] ftrace: updates to tip Message-ID: <20090117223451.GA27065@elte.hu> References: <20090116004050.273665842@goodmis.org> <20090116112345.GC20082@elte.hu> <20090116152103.GA28643@elte.hu> <20090116160202.GA15209@elte.hu> <20090116163021.GA27495@elte.hu> <20090116225948.GA12314@elte.hu> 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: 1.0 X-ELTE-SpamLevel: s X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=1.0 required=5.9 tests=BAYES_50 autolearn=no SpamAssassin version=3.2.3 1.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60% [score: 0.4618] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 635 Lines: 18 * Steven Rostedt wrote: > > This would allow the creation of "surgical" one-time traces - of > > events and functions one is specifically interested in. > > This all sounds great, but it would add a lot of conditionals into a > extremely hot function tracer path. [...] Why would we need more than exactly one unlikely() condition to handle all of this? 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/