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Commit 3fcdaed4 authored by Matt Wagantall's avatar Matt Wagantall Committed by Stephen Boyd
Browse files

trace: power: add cpu_frequency_switch_{start, end} 



It is sometimes useful to profile how long CPU frequency switches
take, since they often involve variable overhead (PLL lock times,
voltage increase time, etc.). Add additional traces to to make this
possible.

Since the overhead involved may differ based on the frequencies
being switched between, record both the start and the end frequencies
as part of the trace.

Change-Id: I2de743fc357dad3590fd4980f65f38f6073d426e
Signed-off-by: default avatarMatt Wagantall <mattw@codeaurora.org>
parent 39c8206a

include/trace/events/power.h

+42 −0
Original line number Diff line number Diff line
@@ -48,6 +48,48 @@ DEFINE_EVENT(cpu, cpu_frequency, 
	TP_ARGS(frequency, cpu_id)

);



TRACE_EVENT(cpu_frequency_switch_start,



	TP_PROTO(unsigned int start_freq, unsigned int end_freq,

		 unsigned int cpu_id),



	TP_ARGS(start_freq, end_freq, cpu_id),



	TP_STRUCT__entry(

		__field(	u32,		start_freq	)

		__field(	u32,		end_freq	)

		__field(	u32,		cpu_id		)

	),



	TP_fast_assign(

		__entry->start_freq = start_freq;

		__entry->end_freq = end_freq;

		__entry->cpu_id = cpu_id;

	),



	TP_printk("start=%lu end=%lu cpu_id=%lu",

		  (unsigned long)__entry->start_freq,

		  (unsigned long)__entry->end_freq,

		  (unsigned long)__entry->cpu_id)

);



TRACE_EVENT(cpu_frequency_switch_end,



	TP_PROTO(unsigned int cpu_id),



	TP_ARGS(cpu_id),



	TP_STRUCT__entry(

		__field(	u32,		cpu_id		)

	),



	TP_fast_assign(

		__entry->cpu_id = cpu_id;

	),



	TP_printk("cpu_id=%lu", (unsigned long)__entry->cpu_id)

);



TRACE_EVENT(machine_suspend,



	TP_PROTO(unsigned int state),