linux-kernel - Re: [PATCH 02/11] tracing: Introduce TRACE_EVENT

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Date:	Fri, 05 Feb 2010 09:47:46 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 02/11] tracing: Introduce TRACE_EVENT_INJECT

On Wed, 2010-02-03 at 10:14 +0100, Frederic Weisbecker wrote:
> TRACE_EVENT_INJECT macro is the same as TRACE_EVENT but takes one

>  #undef DEFINE_EVENT
>  #define DEFINE_EVENT(template, call, proto, args)		\
>  static void ftrace_profile_##call(proto)			\
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 189b09b..5c75cc7 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -142,6 +142,9 @@ static int ftrace_event_enable_disable(struct ftrace_event_call *call,
>  				break;
>  			}
>  			call->enabled = 1;
> +
> +			if (call->inject)
> +				call->inject();
>  		}
>  		break;
>  	}

With the proposal I'm suggesting:

register_event_command(event, NULL, NULL, inject_me, inject_me, data);

The above would do basically what this patch does. When ever the event
is enabled or disabled the inject_me function will be called.

Would this work?

-- Steve


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