Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758420AbZDGFIY (ORCPT ); Tue, 7 Apr 2009 01:08:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751435AbZDGFIN (ORCPT ); Tue, 7 Apr 2009 01:08:13 -0400 Received: from rv-out-0506.google.com ([209.85.198.233]:52831 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979AbZDGFIM convert rfc822-to-8bit (ORCPT ); Tue, 7 Apr 2009 01:08:12 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Ijoa3vu1y8aK0+jZuWsdQNmEgTHMAF8S4d3ORZJkYuhEpEysdO0/Z14gd3l5ywYt8f zit2MQdyCeGaA5pRI/jO1zqdpHp5Qwmyeprf3tk5OILylZB/AFkWQDC1xhwKOZS5G9ZV mifqely/gJ38oaFT4NWco9BwuseqdUpazv3/4= MIME-Version: 1.0 In-Reply-To: <1239068812.4753.15.camel@localhost.localdomain> References: <49b7c2350904060702j3f725a45ub5e7d3ee3af883c1@mail.gmail.com> <1239068812.4753.15.camel@localhost.localdomain> Date: Tue, 7 Apr 2009 14:08:10 +0900 Message-ID: <49b7c2350904062208qc16ef6ag9a33bef66721f4e@mail.gmail.com> Subject: Re: [PATCH] Update old Mini-HOWTO for ftrace From: GeunSik Lim To: Steven Rostedt Cc: Ingo Molnar , rt-users , "linux-kernel@vger.kernel.org" , Nikanth Karthikensan Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3479 Lines: 95 Dear steven, I confirm http://lkml.org/lkml/2009/3/23/24 webpage now. I am gratified with a similar patch that another people sent this problem. In fact, I figured out trivial problem of old mini-HOWTO according to http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.1/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-Using_the_ftrace_Utility_for_Tracing_Latencies.html web manual. I want you to change MRG Kernel from ftrace to function for consistency in private. Thank you for interesting article Regards, GeunSik Lim.. 2009/4/7 Steven Rostedt : > > On Mon, 2009-04-06 at 23:02 +0900, GeunSik Lim wrote: >> Dear Steven, >> >>    The author of ftrace(Internal kernel Function Tracer) feature >> renamed the ftrace tracer >>     to function to avoid further confusion between the ftrace >> infrastructure and the >>     function tracer on Oct-20, 2008. >> >>     But, Update of Mini-HOWTO document are still not working >>     . >>     Most of the developers often utilize "/debug/tracing/README" file >> as Mini-HOWTO. >>     They will confuse definition and usage about ftrace  between >> README(ftrace) file >>     and available_tracers(function) file after linux-2.6.27 like me. >>     And, I want you to append "chrt -f 5 sleep 1" command as simple >> example for latency. >> >>     Signed-off-by: GeunSik Lim >>     Signed-off-by: Steven Rostedt >>     Signed-off-by: Ingo Molnar >> --- >>  kernel/trace/trace.c |    3 ++- >>  1 files changed, 2 insertions(+), 1 deletions(-) >> >> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c >> index a0174a4..15f0eec 100644 >> --- a/kernel/trace/trace.c >> +++ b/kernel/trace/trace.c >> @@ -2358,7 +2358,7 @@ static const char readme_msg[] = >>         "# mkdir /debug\n" >>         "# mount -t debugfs nodev /debug\n\n" >>         "# cat /debug/tracing/available_tracers\n" >> -       "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" >> +       "wakeup preemptirqsoff preemptoff irqsoff function >> sched_switch none\n\n" >>         "# cat /debug/tracing/current_tracer\n" >>         "none\n" >>         "# echo sched_switch > /debug/tracing/current_tracer\n" >> @@ -2368,6 +2368,7 @@ static const char readme_msg[] = >>         "noprint-parent nosym-offset nosym-addr noverbose\n" >>         "# echo print-parent > /debug/tracing/trace_options\n" >>         "# echo 1 > /debug/tracing/tracing_enabled\n" >> +       "# chrt -f 5 sleep 1\n" >>         "# cat /debug/tracing/trace > /tmp/trace.txt\n" >>         "echo 0 > /debug/tracing/tracing_enabled\n" >>  ; >> > > Actually Nikanth sent a similar patch a month ago, but somehow it > slipped under the radar. I'll be picking that one up instead. > > http://lkml.org/lkml/2009/3/23/24 > > But thanks anyway. > > -- Steve > > > -- Regards, GeunSik Lim -- 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/ -- 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/