linux-kernel - Re: [PATCH] tracing, perf: add more power related events

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Message-Id: <201009180017.03821.trenn@suse.de>
Date:	Sat, 18 Sep 2010 00:17:03 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Jean Pihet <jean.pihet@...oldbits.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>, arjan@...radead.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	linux-kernel@...r.kernel.org, discuss@...swatts.org,
	linux-pm@...ts.linux-foundation.org, linux-omap@...r.kernel.org,
	linux-perf-users@...r.kernel.org, linux-trace-users@...r.kernel.org
Subject: Re: [PATCH] tracing, perf: add more power related events

DO NOT APPLY THIS ONE!!!
	
The others should go into a mainline tree if Jean is ok with them.

This one does not work, due to some include dependencies or whatever
else I can't see right now.

The idea: Provide old trace power interfaces via .config option to not break
existing perf/powertop/.. binaries.
Not sure whether it's worth looking at it further. It shouldn't be needed...

       Thomas

---
 include/trace/events/power.h |   11 +++++++++++
 kernel/trace/Kconfig         |    4 ++++
 2 files changed, 15 insertions(+)

Index: linux-2.6.35-master/kernel/trace/Kconfig
===================================================================
--- linux-2.6.35-master.orig/kernel/trace/Kconfig
+++ linux-2.6.35-master/kernel/trace/Kconfig
@@ -64,6 +64,10 @@ config EVENT_TRACING
 	select CONTEXT_SWITCH_TRACER
 	bool
 
+config DEPRECATED_POWER_EVENT_TRACING
+       bool
+       default n
+
 config CONTEXT_SWITCH_TRACER
 	bool
 
Index: linux-2.6.35-master/include/trace/events/power.h
===================================================================
--- linux-2.6.35-master.orig/include/trace/events/power.h
+++ linux-2.6.35-master/include/trace/events/power.h
@@ -50,6 +50,7 @@ DEFINE_EVENT(power, power_switch_state,
 	TP_ARGS(type, state, cpu_id)
 );
 
+#ifdef CONFIG_DEPRECATED_POWER_EVENT_TRACING
 DEFINE_EVENT(power, power_start,
 
 	TP_PROTO(unsigned int type, unsigned int state, unsigned int cpu_id),
@@ -81,6 +82,16 @@ TRACE_EVENT(power_end,
 	TP_printk("cpu_id=%lu", (unsigned long)__entry->cpu_id)
 
 );
+#else
+inline void trace_power_end(unsigned int cpu_id)
+{}
+inline void trace_power_start(unsigned int type, unsigned int state,
+			      unsigned int cpu_id)
+{}
+inline void trace_power_frequency(unsigned int type, unsigned int state,
+				  unsigned int cpu_id)
+{}
+#endif
 
 /*
  * The clock events are used for clock enable/disable and for

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