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mac80211: use coarse boottime for airtime fairness code

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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 <nbd@nbd.name>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20211217114258.14619-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2021-12-17 12:42:58 +01:00 committed by Johannes Berg
parent 75c5bd68b6
commit 6a789ba679
1 changed files with 5 additions and 5 deletions
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10
net/mac80211/tx.c
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@ -3821,7 +3821,7 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
{
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(struct ieee80211_local *local,
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 ieee80211_hw *hw,
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(struct ieee80211_hw *hw,
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 ieee80211_hw *hw,
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.