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devfreq_cooling: add trace information

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Tracing is useful for debugging and performance tuning.  Add similar
traces to what's present in the cpu cooling device.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Javi Merino 2015-09-10 18:09:31 +01:00 committed by Eduardo Valentin
parent a76caf55e5
commit 9876b1a443
2 changed files with 59 additions and 0 deletions
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6
drivers/thermal/devfreq_cooling.c
View file

@ -25,6 +25,8 @@
#include <linux/pm_opp.h>
#include <linux/thermal.h>
#include <trace/events/thermal.h>
static DEFINE_MUTEX(devfreq_lock);
static DEFINE_IDR(devfreq_idr);
@ -293,6 +295,9 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd
/* Get static power */
static_power = get_static_power(dfc, freq);
trace_thermal_power_devfreq_get_power(cdev, status, freq, dyn_power,
static_power);
*power = dyn_power + static_power;
return 0;
@ -348,6 +353,7 @@ static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev,
break;
*state = i;
trace_thermal_power_devfreq_limit(cdev, freq, *state, power);
return 0;
}

53
include/trace/events/thermal.h
View file

@ -4,6 +4,7 @@
#if !defined(_TRACE_THERMAL_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_THERMAL_H
#include <linux/devfreq.h>
#include <linux/thermal.h>
#include <linux/tracepoint.h>
@ -135,6 +136,58 @@ TRACE_EVENT(thermal_power_cpu_limit,
__entry->power)
);
TRACE_EVENT(thermal_power_devfreq_get_power,
TP_PROTO(struct thermal_cooling_device *cdev,
struct devfreq_dev_status *status, unsigned long freq,
u32 dynamic_power, u32 static_power),
TP_ARGS(cdev, status, freq, dynamic_power, static_power),
TP_STRUCT__entry(
__string(type, cdev->type )
__field(unsigned long, freq )
__field(u32, load )
__field(u32, dynamic_power )
__field(u32, static_power )
),
TP_fast_assign(
__assign_str(type, cdev->type);
__entry->freq = freq;
__entry->load = (100 * status->busy_time) / status->total_time;
__entry->dynamic_power = dynamic_power;
__entry->static_power = static_power;
),
TP_printk("type=%s freq=%lu load=%u dynamic_power=%u static_power=%u",
__get_str(type), __entry->freq,
__entry->load, __entry->dynamic_power, __entry->static_power)
);
TRACE_EVENT(thermal_power_devfreq_limit,
TP_PROTO(struct thermal_cooling_device *cdev, unsigned long freq,
unsigned long cdev_state, u32 power),
TP_ARGS(cdev, freq, cdev_state, power),
TP_STRUCT__entry(
__string(type, cdev->type)
__field(unsigned int, freq )
__field(unsigned long, cdev_state)
__field(u32, power )
),
TP_fast_assign(
__assign_str(type, cdev->type);
__entry->freq = freq;
__entry->cdev_state = cdev_state;
__entry->power = power;
),
TP_printk("type=%s freq=%u cdev_state=%lu power=%u",
__get_str(type), __entry->freq, __entry->cdev_state,
__entry->power)
);
#endif /* _TRACE_THERMAL_H */
/* This part must be outside protection */