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Date: Wed, 11 Jun 2014 08:49:08 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Punit Agrawal <punit.agrawal@....com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
javi.merino@....com, Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC PATCH 3/3] thermal: trace: Trace when temperature is above
a trip point
On Wed, 11 Jun 2014 12:31:44 +0100
Punit Agrawal <punit.agrawal@....com> wrote:
> Create a new event to trace when the temperature is above a trip
> point. Use the trace-point when handling non-critical and critical
> trip pionts.
>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Eduardo Valentin <edubezval@...il.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Signed-off-by: Punit Agrawal <punit.agrawal@....com>
> ---
> Hi Steven,
>
> I am facing an issue with partial trace being emitted when using
> __print_symbolic in this patch.
>
> When the trip_type is THERMAL_TRIP_ACTIVE (i.e., the first value in
> the symbol map), the emitted trace contains the corresponding string
> ("active"). But for other values of trip_type an empty string is
> emitted in the trace.
>
> I've looked at other uses of __print_symbolic in the kernel and don't
> see any difference in usage. Do you know what could be causing this or
> alternately have any pointers on how to debug this behaviour?
>
If you can use trace-cmd to record your events then we can look at the
raw data too.
trace-cmd record -e thermal_zone_trip <some-command>
where <some-command> would trigger your tracepoint.
Then do: trace-cmd report -R
You should see the raw value of trip_type.
Make sure that it matches the enum values that you have listed.
-- Steve
> Thanks.
> Punit
>
> drivers/thermal/fair_share.c | 7 ++++++-
> drivers/thermal/step_wise.c | 5 ++++-
> drivers/thermal/thermal_core.c | 2 ++
> include/trace/events/thermal.h | 30 ++++++++++++++++++++++++++++++
> 4 files changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/fair_share.c b/drivers/thermal/fair_share.c
> index 944ba2f..2cddd68 100644
> --- a/drivers/thermal/fair_share.c
> +++ b/drivers/thermal/fair_share.c
> @@ -23,6 +23,7 @@
> */
>
> #include <linux/thermal.h>
> +#include <trace/events/thermal.h>
>
> #include "thermal_core.h"
>
> @@ -34,14 +35,18 @@ static int get_trip_level(struct thermal_zone_device *tz)
> {
> int count = 0;
> unsigned long trip_temp;
> + enum thermal_trip_type trip_type;
>
> if (tz->trips == 0 || !tz->ops->get_trip_temp)
> return 0;
>
> for (count = 0; count < tz->trips; count++) {
> tz->ops->get_trip_temp(tz, count, &trip_temp);
> - if (tz->temperature < trip_temp)
> + if (tz->temperature < trip_temp) {
> + tz->ops->get_trip_type(tz, count, &trip_type);
> + trace_thermal_zone_trip(tz, count, trip_type);
> break;
> + }
> }
> return count;
> }
> diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
> index f251521..3b54c2c 100644
> --- a/drivers/thermal/step_wise.c
> +++ b/drivers/thermal/step_wise.c
> @@ -23,6 +23,7 @@
> */
>
> #include <linux/thermal.h>
> +#include <trace/events/thermal.h>
>
> #include "thermal_core.h"
>
> @@ -129,8 +130,10 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>
> trend = get_tz_trend(tz, trip);
>
> - if (tz->temperature >= trip_temp)
> + if (tz->temperature >= trip_temp) {
> throttle = true;
> + trace_thermal_zone_trip(tz, trip, trip_type);
> + }
>
> dev_dbg(&tz->device, "Trip%d[type=%d,temp=%ld]:trend=%d,throttle=%d\n",
> trip, trip_type, trip_temp, trend, throttle);
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index c74c78d..454884a 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -371,6 +371,8 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
> if (tz->temperature < trip_temp)
> return;
>
> + trace_thermal_zone_trip(tz, trip, trip_type);
> +
> if (tz->ops->notify)
> tz->ops->notify(tz, trip, trip_type);
>
> diff --git a/include/trace/events/thermal.h b/include/trace/events/thermal.h
> index 894a79e..5eeb1e7 100644
> --- a/include/trace/events/thermal.h
> +++ b/include/trace/events/thermal.h
> @@ -51,6 +51,36 @@ TRACE_EVENT(cdev_update,
> TP_printk("type=%s target=%lu", __get_str(type), __entry->target)
> );
>
> +TRACE_EVENT(,
> +
> + TP_PROTO(struct thermal_zone_device *tz, int trip,
> + enum thermal_trip_type trip_type),
> +
> + TP_ARGS(tz, trip, trip_type),
> +
> + TP_STRUCT__entry(
> + __string(thermal_zone, tz->type)
> + __field(int, id)
> + __field(int, trip)
> + __field(enum thermal_trip_type, trip_type)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(thermal_zone, tz->type);
> + __entry->id = tz->id;
> + __entry->trip = trip;
> + __entry->trip_type = trip_type;
> + ),
> +
> + TP_printk("thermal_zone=%s id=%d trip=%d trip_type=%s",
> + __get_str(thermal_zone), __entry->id, __entry->trip,
> + __print_symbolic(__entry->trip_type,
> + { THERMAL_TRIP_ACTIVE, "active" },
> + { THERMAL_TRIP_PASSIVE, "passive" },
> + { THERMAL_TRIP_HOT, "hot" },
> + { THERMAL_TRIP_CRITICAL, "critical" }))
> +);
> +
> #endif /* _TRACE_THERMAL_H */
>
> /* This part must be outside protection */
--
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