[PATCH v2 6/8] thermal/debugfs: Compute maximum temperature for mitigation episode as a whole

From: Rafael J. Wysocki
Date: Tue May 28 2024 - 11:02:03 EST


From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

Notice that the maximum temperature above the trip point must be the
same for all of the trip points involved in a given mitigation episode,
so it need not be computerd for each of them separately.

It is sufficient to compute the maximum temperature for the mitigation
episode as a whole and print it accordingly, so do that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---

v1 -> v2:
* Rebase.
* Take patch [5/8] into account.

---
drivers/thermal/thermal_debugfs.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -94,7 +94,6 @@ struct cdev_record {
* @trip_temp: trip temperature at mitigation start
* @trip_hyst: trip hysteresis at mitigation start
* @count: the number of times the zone temperature was above the trip point
- * @max: maximum recorded temperature above the trip point
* @min: minimum recorded temperature above the trip point
* @avg: average temperature above the trip point
*/
@@ -104,7 +103,6 @@ struct trip_stats {
int trip_temp;
int trip_hyst;
int count;
- int max;
int min;
int avg;
};
@@ -122,12 +120,14 @@ struct trip_stats {
* @timestamp: first trip point crossed the way up
* @duration: total duration of the mitigation episode
* @node: a list element to be added to the list of tz events
+ * @max_temp: maximum zone temperature during this episode
* @trip_stats: per trip point statistics, flexible array
*/
struct tz_episode {
ktime_t timestamp;
ktime_t duration;
struct list_head node;
+ int max_temp;
struct trip_stats trip_stats[];
};

@@ -561,11 +561,11 @@ static struct tz_episode *thermal_debugf
INIT_LIST_HEAD(&tze->node);
tze->timestamp = now;
tze->duration = KTIME_MIN;
+ tze->max_temp = INT_MIN;

for (i = 0; i < tz->num_trips; i++) {
tze->trip_stats[i].trip_temp = THERMAL_TEMP_INVALID;
tze->trip_stats[i].min = INT_MAX;
- tze->trip_stats[i].max = INT_MIN;
}

return tze;
@@ -738,11 +738,13 @@ void thermal_debug_update_trip_stats(str

tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);

+ if (tz->temperature > tze->max_temp)
+ tze->max_temp = tz->temperature;
+
for (i = 0; i < tz_dbg->nr_trips; i++) {
int trip_id = tz_dbg->trips_crossed[i];
struct trip_stats *trip_stats = &tze->trip_stats[trip_id];

- trip_stats->max = max(trip_stats->max, tz->temperature);
trip_stats->min = min(trip_stats->min, tz->temperature);
trip_stats->avg += (tz->temperature - trip_stats->avg) /
++trip_stats->count;
@@ -798,10 +800,10 @@ static int tze_seq_show(struct seq_file
c = '=';
}

- seq_printf(s, ",-Mitigation at %llums, duration%c%llums\n",
- ktime_to_ms(tze->timestamp), c, duration_ms);
+ seq_printf(s, ",-Mitigation at %llums, duration%c%llums, max. temp=%dm°C\n",
+ ktime_to_ms(tze->timestamp), c, duration_ms, tze->max_temp);

- seq_printf(s, "| trip | type | temp(m°C) | hyst(m°C) | duration(ms) | avg(m°C) | min(m°C) | max(m°C) |\n");
+ seq_printf(s, "| trip | type | temp(m°C) | hyst(m°C) | duration(ms) | avg(m°C) | min(m°C) |\n");

for_each_trip_desc(tz, td) {
const struct thermal_trip *trip = &td->trip;
@@ -842,15 +844,14 @@ static int tze_seq_show(struct seq_file
c = ' ';
}

- seq_printf(s, "| %*d | %*s | %*d | %*d | %c%*lld | %*d | %*d | %*d |\n",
+ seq_printf(s, "| %*d | %*s | %*d | %*d | %c%*lld | %*d | %*d |\n",
4 , trip_id,
8, type,
9, trip_stats->trip_temp,
9, trip_stats->trip_hyst,
c, 11, duration_ms,
9, trip_stats->avg,
- 9, trip_stats->min,
- 9, trip_stats->max);
+ 9, trip_stats->min);
}

return 0;