diff options
| author |   Felix Fietkau <nbd@nbd.name> | 2021-12-17 12:42:58 +0100 |
|---|---|---|
| committer |   Johannes Berg <johannes.berg@intel.com> | 2021-12-20 10:24:41 +0100 |
| commit | 6a789ba679d652587532cec2a0e0274fda172f3b (patch) | |
| tree | 01b41505b220e6458c7b3a6eda358cfb2d35f687 /net/mac80211/tx.c | |
| parent | ieee80211: change HE nominal packet padding value defines (diff) | |
| download | linux-dev-6a789ba679d652587532cec2a0e0274fda172f3b.tar.xz linux-dev-6a789ba679d652587532cec2a0e0274fda172f3b.zip | |
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 <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>
Diffstat (limited to 'net/mac80211/tx.c')
| -rw-r--r-- | net/mac80211/tx.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 278945e3e08a..cbe7d1d00a50 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -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. |