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rcu/nocb: Update comments to prepare for forward-progress work

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This commit simply rewords comments 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
comments with these strings to "GP" and "CB", respectively.  (Give or
take the usual grammatical transformations.)

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2019-03-28 15:44:18 -07:00
parent 58bf6f77c6
commit 6484fe54b5
2 changed files with 33 additions and 32 deletions
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8
kernel/rcu/tree.h
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@@ -206,17 +206,17 @@ struct rcu_data {
int nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */
struct timer_list nocb_timer; /* Enforce finite deferral. */
/* The following fields are used by the leader, hence own cacheline. */
/* The following fields are used by GP kthread, hence own cacheline. */
struct rcu_head *nocb_gp_head ____cacheline_internodealigned_in_smp;
/* CBs waiting for GP. */
struct rcu_head **nocb_gp_tail;
bool nocb_gp_sleep; /* Is the nocb leader thread asleep? */
bool nocb_gp_sleep; /* Is the nocb GP 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. */
/* The following fields are used by CB kthread, hence new cachline. */
struct rcu_data *nocb_gp_rdp ____cacheline_internodealigned_in_smp;
/* Leader CPU takes GP-end wakeups. */
/* GP rdp takes GP-end wakeups. */
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */
/* 6) RCU priority boosting. */