Used by a reader to inform the reclaimer that the reader is
entering an RCU read-side critical section. It is illegal
to block while in an RCU read-side critical section, though
- kernels built with CONFIG_PREEMPT_RCU can preempt RCU read-side
- critical sections. Any RCU-protected data structure accessed
- during an RCU read-side critical section is guaranteed to remain
- unreclaimed for the full duration of that critical section.
+ kernels built with CONFIG_TREE_PREEMPT_RCU can preempt RCU
+ read-side critical sections. Any RCU-protected data structure
+ accessed during an RCU read-side critical section is guaranteed to
+ remain unreclaimed for the full duration of that critical section.
Reference counts may be used in conjunction with RCU to maintain
longer-term references to data structures.
rcu_dereference
list_for_each_entry_rcu
hlist_for_each_entry_rcu
+ hlist_nulls_for_each_entry_rcu
list_for_each_continue_rcu (to be deprecated in favor of new
list_for_each_entry_continue_rcu)
rcu_read_lock synchronize_net rcu_barrier
rcu_read_unlock synchronize_rcu
+ synchronize_rcu_expedited
call_rcu
bh: Critical sections Grace period Barrier
rcu_read_lock_bh call_rcu_bh rcu_barrier_bh
- rcu_read_unlock_bh
+ rcu_read_unlock_bh synchronize_rcu_bh
+ synchronize_rcu_bh_expedited
sched: Critical sections Grace period Barrier
- [preempt_disable] synchronize_sched rcu_barrier_sched
- [and friends] call_rcu_sched
+ rcu_read_lock_sched synchronize_sched rcu_barrier_sched
+ rcu_read_unlock_sched call_rcu_sched
+ [preempt_disable] synchronize_sched_expedited
+ [and friends]
SRCU: Critical sections Grace period Barrier
srcu_read_lock synchronize_srcu N/A
srcu_read_unlock
+SRCU: Initialization/cleanup
+ init_srcu_struct
+ cleanup_srcu_struct
See the comment headers in the source code (or the docbook generated
from them) for more information.