linux-kernel - Re: [PATCH][RFC] tracing: Enable tracepoints via module parameters

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Message-ID: <20110309020131.GA19224@yliu-dev.sh.intel.com>
Date:	Wed, 9 Mar 2011 10:01:31 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	chris <chris@...is-wilson.co.uk>
Subject: Re: [PATCH][RFC] tracing: Enable tracepoints via module parameters

On Tue, Mar 08, 2011 at 07:52:04PM -0500, Steven Rostedt wrote:
> On Tue, 2011-03-08 at 19:29 -0500, Mathieu Desnoyers wrote:
> > * Steven Rostedt (rostedt@...dmis.org) wrote:
> > > On Tue, 2011-03-08 at 19:07 -0500, Mathieu Desnoyers wrote:

[snip]
 
> > 
> > > 
> > > If you want to enable a tracepoint on module load simply do:
> > > 
> > >  modprobe mymod trace_my_tracepoint=1
> > > 
> > > Otherwise modify your modprobe.d directory. This is the way users have
> > > been doing module parameters for years.
> > > 
> > > That's pretty simple to me.
> > 
> > Everything is always so much easier when your end-user target is yourself.
> > What are users for anyway ? :-P
> 
> Users are for testing code ;)

As another end-user, this looks fine (also simple) to me ;)

> 
> But that's a good question. As I wrote this because I'm purging my inbox
> and came across Yuanhan Liu's patch set. I'm curios to what Yuanhan's
> motivation for this change was.

The motivation of my original patch is simple: try to not miss any trace
events. I guess it's a kind of feature that trace(or module) should
have ;) 


Thanks,
Yuanhan Liu
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