Messages in this thread Patch in this message | | | Date | Wed, 1 Sep 2021 16:03:20 -0700 | From | Davidlohr Bueso <> | Subject | Re: [PATCH 2/2] locking/rwbase_rt: Lockless reader waking up a writer |
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On Wed, 01 Sep 2021, Bueso wrote:
>As with the rest of our sleeping locks, use a wake_q to >allow waking up the writer without having to hold the >wait_lock across the operation. While this is ideally >for batching wakeups, single wakeup usage as still shown >to be beneficial vs the cost of try_to_wakeup when the >lock is contended. > >Signed-off-by: Davidlohr Bueso <dbueso@suse.de> >--- > kernel/locking/rwbase_rt.c | 4 +++- > kernel/sched/core.c | 16 +++++++++++++---
Bleh, this of course is missing:
diff --git a/include/linux/sched/wake_q.h b/include/linux/sched/wake_q.h index 06cd8fb2f409..695efd987b56 100644 --- a/include/linux/sched/wake_q.h +++ b/include/linux/sched/wake_q.h @@ -62,5 +62,6 @@ static inline bool wake_q_empty(struct wake_q_head *head) extern void wake_q_add(struct wake_q_head *head, struct task_struct *task); extern void wake_q_add_safe(struct wake_q_head *head, struct task_struct *task); extern void wake_up_q(struct wake_q_head *head); +extern void wake_up_q_state(struct wake_q_head *head, unsigned int state); #endif /* _LINUX_SCHED_WAKE_Q_H */
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