linux-kernel - Re: [RFC PATCH v2] Tracepoint: register/unregister struct tracepoint

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Date:	Thu, 13 Mar 2014 18:22:52 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Berg <johannes.berg@...el.com>
Subject: Re: [RFC PATCH v2] Tracepoint: register/unregister struct
 tracepoint

----- Original Message -----
> From: "Steven Rostedt" <rostedt@...dmis.org>
> To: "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>
> Cc: "Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...nel.org>, "Frederic
> Weisbecker" <fweisbec@...il.com>, "Andrew Morton" <akpm@...ux-foundation.org>, "Johannes Berg"
> <johannes.berg@...el.com>
> Sent: Thursday, March 13, 2014 2:17:53 PM
> Subject: Re: [RFC PATCH v2] Tracepoint: register/unregister struct tracepoint
> 
> On Thu, 2014-03-13 at 16:54 +0000, Mathieu Desnoyers wrote:
> 
> > The other use-case is if the tracer has a module coming/going notifier
> > tracking the module's tracepoint callsites. The going notifier should
> > be run before the tracepoint.c going notifier. A notifier with negative
> > priority should have this effect, since the tracepoint.c notifier has
> > priority 0.
> > 
> 
> The tracepoint should change to have two different notifiers that
> represent one for coming and one for going (as ftrace does). The coming
> one should have a priority of 0 (or INT_MIN (all other notifiers
> dependent on this should have > 0)
> 
> The going notifier should have a INT_MAX to run after all other
> tracepoint notifiers. (see kernel/trace/ftrace.c ftrace_module_enter_nb
> and ftrace_module_exit_nb)

OK, I'll spin a v4 with this change.

Thanks!

Mathieu

> 
> -- Steve
> 
> 
> 

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