Commit 7bf5a6ed authored May 09, 2012 by Colin Cross Committed by Ruchi Kandoi Feb 03, 2015

trace: power: add trace_clock_set_parent



Adds a new trace event to be called from clk_set_parent.  Some
cpufreq drivers, including Tegra, reparent the cpu clock to a
slower clock while the main pll is relocking, tracing
clk_set_parent allows traces to show how for long the cpu is
running slower.

Uses a separate TRACE_EVENT instead of the clock event class to
allow the event to contain string names for the child and the
parent.

Signed-off-by: Colin Cross <ccross@android.com>

parent cb0d1ec3

include/trace/events/power.h

+19 −0

Original line number	Diff line number	Diff line
		@@ -264,6 +264,25 @@ DEFINE_EVENT(clock, clock_set_rate,
		TP_ARGS(name, state, cpu_id)
		);

		TRACE_EVENT(clock_set_parent,

		TP_PROTO(const char name, const char parent_name),

		TP_ARGS(name, parent_name),

		TP_STRUCT__entry(
		__string( name, name )
		__string( parent_name, parent_name )
		),

		TP_fast_assign(
		__assign_str(name, name);
		__assign_str(parent_name, parent_name);
		),

		TP_printk("%s parent=%s", __get_str(name), __get_str(parent_name))
		);

		/*
		* The power domain events are used for power domains transitions
		*/