linux-kernel - Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

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Date:	Tue, 19 Oct 2010 18:33:54 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Koki Sanagi <sanagi.koki@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	nhorman@...driver.com, scott.a.mcmillan@...el.com,
	laijs@...fujitsu.com, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, eric.dumazet@...il.com,
	kaneshige.kenji@...fujitsu.com, David Miller <davem@...emloft.net>,
	izumi.taku@...fujitsu.com, kosaki.motohiro@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

On Wed, 2010-10-20 at 00:04 +0200, Thomas Gleixner wrote:

> hpa just posted code which does the _RIGHT_ _THING_ independent of any
> compiler madness and you tracer folks just missed it.

Thomas,

Can you try this patch and see if it makes the object code better?

-- Steve


diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index a4a90b6..6264bd3 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -144,14 +144,19 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
  */
 #define __DECLARE_TRACE(name, proto, args, data_proto, data_args)	\
 	extern struct tracepoint __tracepoint_##name;			\
-	static inline void trace_##name(proto)				\
+	static __always_inline int __trace_##name(proto)		\
 	{								\
 		JUMP_LABEL(&__tracepoint_##name.state, do_trace);	\
-		return;							\
+		return 0;						\
 do_trace:								\
 			__DO_TRACE(&__tracepoint_##name,		\
 				TP_PROTO(data_proto),			\
 				TP_ARGS(data_args));			\
+			return 1;					\
+	}								\
+	static inline void trace_##name(proto)				\
+	{								\
+		unlikely(__trace_##name(args));				\
 	}								\
 	static inline int						\
 	register_trace_##name(void (*probe)(data_proto), void *data)	\


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