linux-kernel - Re: [PATCH][RFC] tracing: Use class->reg() for all registering of events

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Date:	Tue, 08 Jun 2010 15:11:32 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [PATCH][RFC] tracing: Use class->reg() for all registering of
 events

On Tue, 2010-06-08 at 15:10 -0400, Steven Rostedt wrote:
> On Tue, 2010-06-08 at 23:05 +0530, Srikar Dronamraju wrote:
> > > On Tue, 2010-06-08 at 11:33 -0400, Steven Rostedt wrote:
> 
> > I tested the patch and it fixed the regression where
> > perf record -e probe:do_fork -aR sleep 1 would fail. 
> > 
> 
> Thanks! Unfortunately the patch does two things, one is to fix this
> regression, the other is a clean up. Linus is currently only wanting
> fixes now and may not accept the clean up part of this patch. Can you
> test the patch below. It only addresses the regression.
> 
> Thanks,


Oh, and this is against latest Linus's branch.

-- Steve

> diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
> index e6f6588..8a2b73f 100644
> --- a/kernel/trace/trace_event_perf.c
> +++ b/kernel/trace/trace_event_perf.c
> @@ -96,7 +96,9 @@ int perf_trace_init(struct perf_event *p_event)
>  	mutex_lock(&event_mutex);
>  	list_for_each_entry(tp_event, &ftrace_events, list) {
>  		if (tp_event->event.type == event_id &&
> -		    tp_event->class && tp_event->class->perf_probe &&
> +		    tp_event->class &&
> +		    (tp_event->class->perf_probe ||
> +		     tp_event->class->reg) &&
>  		    try_module_get(tp_event->mod)) {
>  			ret = perf_trace_event_init(tp_event, p_event);
>  			break;
> 


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