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rcu/nocb: Rename rcu_data fields to prepare for forward-progress work

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This commit simply renames rcu_data fields to prepare for leader
nocb kthreads doing only grace-period work and callback shuffling.
This will mean the addition of replacement kthreads to invoke callbacks.
The "leader" and "follower" thus become less meaningful, so the commit
changes no-CB fields with these strings to "gp" and "cb", respectively.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-03-28 15:33:59 -07:00
parent 31da067023
commit 58bf6f77c6
2 changed files with 46 additions and 46 deletions
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14
kernel/rcu/tree.h
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@ -198,10 +198,10 @@ struct rcu_data {
struct rcu_head **nocb_tail;
atomic_long_t nocb_q_count; /* # CBs waiting for nocb */
atomic_long_t nocb_q_count_lazy; /* invocation (all stages). */
struct rcu_head *nocb_follower_head; /* CBs ready to invoke. */
struct rcu_head **nocb_follower_tail;
struct rcu_head *nocb_cb_head; /* CBs ready to invoke. */
struct rcu_head **nocb_cb_tail;
struct swait_queue_head nocb_wq; /* For nocb kthreads to sleep on. */
struct task_struct *nocb_kthread;
struct task_struct *nocb_cb_kthread;
raw_spinlock_t nocb_lock; /* Guard following pair of fields. */
int nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */
struct timer_list nocb_timer; /* Enforce finite deferral. */
@ -210,12 +210,12 @@ struct rcu_data {
struct rcu_head *nocb_gp_head ____cacheline_internodealigned_in_smp;
/* CBs waiting for GP. */
struct rcu_head **nocb_gp_tail;
bool nocb_leader_sleep; /* Is the nocb leader thread asleep? */
struct rcu_data *nocb_next_follower;
/* Next follower in wakeup chain. */
bool nocb_gp_sleep; /* Is the nocb leader thread asleep? */
struct rcu_data *nocb_next_cb_rdp;
/* Next rcu_data in wakeup chain. */
/* The following fields are used by the follower, hence new cachline. */
struct rcu_data *nocb_leader ____cacheline_internodealigned_in_smp;
struct rcu_data *nocb_gp_rdp ____cacheline_internodealigned_in_smp;
/* Leader CPU takes GP-end wakeups. */
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */