Introduce and use an event to trace when a cooling device's state is
updated. This is useful to follow the effect of governor decisions on
cooling devices.
Cc: Zhang Rui <rui.zh...@intel.com>
Cc: Eduardo Valentin <edubez...@gmail.com>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@redhat.com>
Signed-off-by: Punit Agrawal <punit.agra...@arm.com>
---
drivers/thermal/thermal_core.c | 1 +
include/trace/events/thermal.h | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 6b32391..c74c78d 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1291,6 +1291,7 @@ void thermal_cdev_update(struct thermal_cooling_device
*cdev)
mutex_unlock(&cdev->lock);
cdev->ops->set_cur_state(cdev, target);
cdev->updated = true;
+ trace_cdev_update(cdev, target);
dev_dbg(&cdev->device, "set to state %lu\n", target);
}
EXPORT_SYMBOL(thermal_cdev_update);
diff --git a/include/trace/events/thermal.h b/include/trace/events/thermal.h
index 8c5ca96..894a79e 100644
--- a/include/trace/events/thermal.h
+++ b/include/trace/events/thermal.h
@@ -32,6 +32,25 @@ TRACE_EVENT(thermal_temperature,
__entry->temp)
);
+TRACE_EVENT(cdev_update,
+
+ TP_PROTO(struct thermal_cooling_device *cdev, unsigned long target),
+
+ TP_ARGS(cdev, target),
+
+ TP_STRUCT__entry(
+ __string(type, cdev->type)
+ __field(unsigned long, target)
+ ),
+
+ TP_fast_assign(
+ __assign_str(type, cdev->type);
+ __entry->target = target;
+ ),
+
+ TP_printk("type=%s target=%lu", __get_str(type), __entry->target)
+);
+
#endif /* _TRACE_THERMAL_H */
/* This part must be outside protection */
--
1.7.10.4
--
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