linux-kernel - Re: [PATCH v9 1/1] Tracepoint: register/unregister struct tracepoint

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Date:	Fri, 4 Apr 2014 03:40:17 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH v9 1/1] Tracepoint: register/unregister struct
 tracepoint

----- Original Message -----
> From: "Steven Rostedt" <rostedt@...dmis.org>
> To: "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>
> Cc: linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...nel.org>, "Frederic Weisbecker" <fweisbec@...il.com>,
> "Andrew Morton" <akpm@...ux-foundation.org>, "Frank Ch. Eigler" <fche@...hat.com>, "Johannes Berg"
> <johannes.berg@...el.com>
> Sent: Thursday, April 3, 2014 2:54:41 PM
> Subject: Re: [PATCH v9 1/1] Tracepoint: register/unregister struct tracepoint
> 
> On Thu, 3 Apr 2014 17:49:54 +0000 (UTC)
> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> 
> 
> > So my current thinking is that the pre-existing code was erroneously
> > enabling tracepoints with the name of every event enabled (including
> > e.g. function tracer, kprobes, etc). It was not failing because
> > tracepoint.c silently accepted to enable tracepoints were not loaded
> > yet.
> > 
> 
> If that was true, than wouldn't the error code I added have returned an
> error?

Good point.

I found the culprit:

[    0.560002] event_trace_enable: �GT����� call ffffffff81613930 (core)                                                                                                      
[    0.564001] event_trace_enable: �GTȁ���� call ffffffff816139c0 (core) 

compudj@ok:~/git/rostedt/linux-trace$ objdump -t vmlinux |grep ffffffff81613930
ffffffff81613930 l     O .data	0000000000000090 event_sys_exit
compudj@ok:~/git/rostedt/linux-trace$ objdump -t vmlinux |grep ffffffff816139c0
ffffffff816139c0 l     O .data	0000000000000090 event_sys_enter

I'll look into those two sites tomorrow morning.

Thanks,

Mathieu

> 
> -- Steve
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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