trace: power: add trace_clock_set_parent

PATCH New Colin Cross 1 participant 1 message May 9, 2012 Tracing

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Colin Cross

author

2012-05-09 23:56 UTC #0 lore raw

PATCH v2 1/1 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 <[email protected]>

---
 include/trace/events/power.h |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

include/trace/events/power.h +19 -0

index cae9a94..9271f5d 100644
@@ -204,6 +204,25 @@ enum {
 	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
  */

Signature · 1 line

1.7.7.3