diff options
| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-06-02 13:41:08 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-08-13 14:35:49 -0700 |
| commit | 4fd8c5f153bc41ae847b9ddb1539b34f70c18278 (patch) | |
| tree | 9ee82606a6959988cb925ec1404e37b66f6145a4 /kernel/rcu/tree.h | |
| parent | 523bddd553c09a2cf051eb724bffba680424f5ec (diff) | |
rcu/nocb: Reduce ->nocb_lock contention with separate ->nocb_gp_lock
The sleep/wakeup of the no-CBs grace-period kthreads is synchronized
using the ->nocb_lock of the first CPU corresponding to that kthread.
This commit provides a separate ->nocb_gp_lock for this purpose, thus
reducing contention on ->nocb_lock.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 7062f9d9c053..2c3e9068671c 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -202,7 +202,8 @@ struct rcu_data { struct timer_list nocb_timer; /* Enforce finite deferral. */ /* The following fields are used by GP kthread, hence own cacheline. */ - bool nocb_gp_sleep ____cacheline_internodealigned_in_smp; + raw_spinlock_t nocb_gp_lock ____cacheline_internodealigned_in_smp; + bool nocb_gp_sleep; /* Is the nocb GP thread asleep? */ struct swait_queue_head nocb_gp_wq; /* For nocb kthreads to sleep on. */ bool nocb_cb_sleep; /* Is the nocb CB thread asleep? */ |