Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-01 10:42:11 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

thermal/debugfs: Avoid excessive updates of trip point statistics

Browse Source 
Since thermal_debug_update_temp() is called before invoking
thermal_debug_tz_trip_down() for the trips that were crossed by the
zone temperature on the way up, it updates the statistics for them
as though the current zone temperature was above the low temperature
of each of them.  However, if a given trip has just been crossed on the
way down, the zone temperature is in fact below its low temperature,
but this is handled by thermal_debug_tz_trip_down() running after the
update of the trip statistics.

The remedy is to call thermal_debug_update_temp() after
thermal_debug_tz_trip_down() has been invoked for all of the
trips in question, but then thermal_debug_tz_trip_up() needs to
be adjusted, so it does not update the statistics for the trips
that has just been crossed on the way up, as that will be taken
care of by thermal_debug_update_temp() down the road.

Modify the code accordingly.

Fixes: 7ef01f228c ("thermal/debugfs: Add thermal debugfs information for mitigation episodes")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2024-04-17 15:09:46 +02:00
parent 2ae0998c67
commit 0a293c7758
2 changed files with 2 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/thermal/thermal_core.c
View File

@ -427,7 +427,6 @@ static void update_temperature(struct thermal_zone_device *tz)
trace_thermal_temperature(tz);
thermal_genl_sampling_temp(tz->id, temp);
thermal_debug_update_temp(tz);
}
static void thermal_zone_device_check(struct work_struct *work)
@ -505,6 +504,8 @@ void __thermal_zone_device_update(struct thermal_zone_device *tz,
if (governor->manage)
governor->manage(tz);
thermal_debug_update_temp(tz);
monitor_thermal_zone(tz);
}

7
drivers/thermal/thermal_debugfs.c
View File

@ -545,7 +545,6 @@ void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
struct tz_episode *tze;
struct tz_debugfs *tz_dbg;
struct thermal_debugfs *thermal_dbg = tz->debugfs;
int temperature = tz->temperature;
int trip_id = thermal_zone_trip_id(tz, trip);
ktime_t now = ktime_get();
@ -614,12 +613,6 @@ void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
tze->trip_stats[trip_id].timestamp = now;
tze->trip_stats[trip_id].max = max(tze->trip_stats[trip_id].max, temperature);
tze->trip_stats[trip_id].min = min(tze->trip_stats[trip_id].min, temperature);
tze->trip_stats[trip_id].count++;
tze->trip_stats[trip_id].avg = tze->trip_stats[trip_id].avg +
(temperature - tze->trip_stats[trip_id].avg) /
tze->trip_stats[trip_id].count;
unlock:
mutex_unlock(&thermal_dbg->lock);