From c12629f832d21e2a87f014174387e605661e91c7 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 16 Oct 2024 13:21:42 +0200 Subject: [PATCH] thermal: core: Build sorted lists instead of sorting them later Since it is not expected that multiple trip points will be crossed in one go very often (if this happens, there are too many trip points in the given thermal zone or they are checked too rarely), quite likely it is more efficient to build a sorted list of crossed trip points than to put them on an unsorted list and sort it later. Moreover, trip points are often sorted in ascending temperature order during thermal zone registration, so building a sorted list out of them is quite straightforward and relatively inexpensive. Accordingly, make handle_thermal_trip() maintain list ordering when adding trip points to the lists and get rid of separate list sorting in __thermal_zone_device_update(). No intentional functional impact. Signed-off-by: Rafael J. Wysocki Reviewed-by: Lukasz Luba Link: https://patch.msgid.link/4930656.GXAFRqVoOG@rjwysocki.net --- drivers/thermal/thermal_core.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 7f0d69b333a03..4f0eafda93498 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #include #include @@ -409,6 +408,21 @@ static void handle_critical_trips(struct thermal_zone_device *tz, tz->ops.hot(tz); } +static void add_trip_to_sorted_list(struct thermal_trip_desc *td, + struct list_head *list) +{ + struct thermal_trip_desc *entry; + + /* Assume that the new entry is likely to be the last one. */ + list_for_each_entry_reverse(entry, list, notify_list_node) { + if (entry->notify_temp <= td->notify_temp) { + list_add(&td->notify_list_node, &entry->notify_list_node); + return; + } + } + list_add(&td->notify_list_node, list); +} + static void handle_thermal_trip(struct thermal_zone_device *tz, struct thermal_trip_desc *td, struct list_head *way_up_list, @@ -438,8 +452,8 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, * In that case, the trip temperature becomes the new threshold. */ if (tz->temperature < trip->temperature - trip->hysteresis) { - list_add(&td->notify_list_node, way_down_list); td->notify_temp = trip->temperature - trip->hysteresis; + add_trip_to_sorted_list(td, way_down_list); if (trip->type == THERMAL_TRIP_PASSIVE) { tz->passive--; @@ -454,8 +468,9 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, * if the zone temperature exceeds the trip one. The new * threshold is then set to the low temperature of the trip. */ - list_add_tail(&td->notify_list_node, way_up_list); td->notify_temp = trip->temperature; + add_trip_to_sorted_list(td, way_up_list); + td->threshold -= trip->hysteresis; if (trip->type == THERMAL_TRIP_PASSIVE) @@ -519,16 +534,6 @@ static void thermal_trip_crossed(struct thermal_zone_device *tz, thermal_governor_trip_crossed(governor, tz, trip, crossed_up); } -static int thermal_trip_notify_cmp(void *not_used, const struct list_head *a, - const struct list_head *b) -{ - struct thermal_trip_desc *tda = container_of(a, struct thermal_trip_desc, - notify_list_node); - struct thermal_trip_desc *tdb = container_of(b, struct thermal_trip_desc, - notify_list_node); - return tda->notify_temp - tdb->notify_temp; -} - void __thermal_zone_device_update(struct thermal_zone_device *tz, enum thermal_notify_event event) { @@ -581,11 +586,9 @@ void __thermal_zone_device_update(struct thermal_zone_device *tz, thermal_zone_set_trips(tz, low, high); - list_sort(NULL, &way_up_list, thermal_trip_notify_cmp); list_for_each_entry(td, &way_up_list, notify_list_node) thermal_trip_crossed(tz, &td->trip, governor, true); - list_sort(NULL, &way_down_list, thermal_trip_notify_cmp); list_for_each_entry_reverse(td, &way_down_list, notify_list_node) thermal_trip_crossed(tz, &td->trip, governor, false); -- 2.47.3