ANDROID: 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>
Bug: None
Patchset: trace-clock-set-parent
Signed-off-by: Mattias Nissler <mnissler@google.com>
Change-Id: Icafb6b1853acea95f670753f72d93836dbb25988
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index eabe684..9af0d89 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -298,6 +298,25 @@
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
*/
