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- From: Felix Fietkau <[email protected]>
- Date: Tue, 14 Dec 2021 17:53:12 +0100
- Subject: [PATCH] mac80211: use coarse boottime for airtime fairness code
- The time values used by the airtime fairness code only need to be accurate
- enough to cover station activity detection.
- Using ktime_get_coarse_boottime_ns instead of ktime_get_boottime_ns will
- drop the accuracy down to jiffies intervals, but at the same time saves
- a lot of CPU cycles in a hot path
- Signed-off-by: Felix Fietkau <[email protected]>
- ---
- --- a/net/mac80211/tx.c
- +++ b/net/mac80211/tx.c
- @@ -3821,7 +3821,7 @@ struct ieee80211_txq *ieee80211_next_txq
- {
- struct ieee80211_local *local = hw_to_local(hw);
- struct airtime_sched_info *air_sched;
- - u64 now = ktime_get_boottime_ns();
- + u64 now = ktime_get_coarse_boottime_ns();
- struct ieee80211_txq *ret = NULL;
- struct airtime_info *air_info;
- struct txq_info *txqi = NULL;
- @@ -3948,7 +3948,7 @@ void ieee80211_update_airtime_weight(str
- u64 weight_sum = 0;
-
- if (unlikely(!now))
- - now = ktime_get_boottime_ns();
- + now = ktime_get_coarse_boottime_ns();
-
- lockdep_assert_held(&air_sched->lock);
-
- @@ -3974,7 +3974,7 @@ void ieee80211_schedule_txq(struct ieee8
- struct ieee80211_local *local = hw_to_local(hw);
- struct txq_info *txqi = to_txq_info(txq);
- struct airtime_sched_info *air_sched;
- - u64 now = ktime_get_boottime_ns();
- + u64 now = ktime_get_coarse_boottime_ns();
- struct airtime_info *air_info;
- u8 ac = txq->ac;
- bool was_active;
- @@ -4032,7 +4032,7 @@ static void __ieee80211_unschedule_txq(s
-
- if (!purge)
- airtime_set_active(air_sched, air_info,
- - ktime_get_boottime_ns());
- + ktime_get_coarse_boottime_ns());
-
- rb_erase_cached(&txqi->schedule_order,
- &air_sched->active_txqs);
- @@ -4120,7 +4120,7 @@ bool ieee80211_txq_may_transmit(struct i
- if (RB_EMPTY_NODE(&txqi->schedule_order))
- goto out;
-
- - now = ktime_get_boottime_ns();
- + now = ktime_get_coarse_boottime_ns();
-
- /* Like in ieee80211_next_txq(), make sure the first station in the
- * scheduling order is eligible for transmission to avoid starvation.
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