Return-path: Received: from mx2.mail.elte.hu ([157.181.151.9]:58585 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753744AbYI0TUk (ORCPT ); Sat, 27 Sep 2008 15:20:40 -0400 Date: Sat, 27 Sep 2008 21:20:19 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Steven Noonan , "Luis R. Rodriguez" , Luis Rodriguez , "ath9k-devel@lists.ath9k.org" , linux-wireless , LKML Subject: Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others) Message-ID: <20080927192019.GE18619@elte.hu> (sfid-20080927_212046_546341_FAE6A627) References: <43e72e890809181508w5232a14ewbf2bf18fe90a92d5@mail.gmail.com> <43e72e890809181610h3a7729d8s4c8484d97b21932e@mail.gmail.com> <20080919030125.GG7408@tesla> <20080919081733.GC19491@elte.hu> <20080919083208.GA15730@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-wireless-owner@vger.kernel.org List-ID: * Steven Rostedt wrote: > > I hate trips where my email box becomes filled. I skip over a lot of > emails that I should not have. > > On Fri, 19 Sep 2008, Ingo Molnar wrote: > > > > What is needed is to set kernel/trace/trace.c's tracing_disabled > > variable to 0. I've Cc:-ed Steve Rostedt - Steve, why is there no easy > > ad-hoc way to trigger a stop-tracing event without elaborate changes? > > I think I added a way to do this. Hmm, I think it was in -rt that I added > it, and have not gotten around to sending you the updates. > > Yes, we need an easy way to disable the tracer. I think we have > ftrace_disable() function. Perhaps that only disables tracing that > checks the tracing_disabled variable. we have kill_ftrace(), but that will permanently zap it. Ingo