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Diffstat (limited to 'Documentation/RCU/whatisRCU.txt')
| -rw-r--r-- | Documentation/RCU/whatisRCU.txt | 58 |
1 files changed, 39 insertions, 19 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt index e0d6d99b8f9b..e04d643a9f57 100644 --- a/Documentation/RCU/whatisRCU.txt +++ b/Documentation/RCU/whatisRCU.txt @@ -1,3 +1,11 @@ +Please note that the "What is RCU?" LWN series is an excellent place +to start learning about RCU: + +1. What is RCU, Fundamentally? http://lwn.net/Articles/262464/ +2. What is RCU? Part 2: Usage http://lwn.net/Articles/263130/ +3. RCU part 3: the RCU API http://lwn.net/Articles/264090/ + + What is RCU? RCU is a synchronization mechanism that was added to the Linux kernel @@ -772,26 +780,18 @@ Linux-kernel source code, but it helps to have a full list of the APIs, since there does not appear to be a way to categorize them in docbook. Here is the list, by category. -Markers for RCU read-side critical sections: - - rcu_read_lock - rcu_read_unlock - rcu_read_lock_bh - rcu_read_unlock_bh - srcu_read_lock - srcu_read_unlock - RCU pointer/list traversal: rcu_dereference + list_for_each_entry_rcu + hlist_for_each_entry_rcu + list_for_each_rcu (to be deprecated in favor of list_for_each_entry_rcu) - list_for_each_entry_rcu list_for_each_continue_rcu (to be deprecated in favor of new list_for_each_entry_continue_rcu) - hlist_for_each_entry_rcu -RCU pointer update: +RCU pointer/list update: rcu_assign_pointer list_add_rcu @@ -799,16 +799,36 @@ RCU pointer update: list_del_rcu list_replace_rcu hlist_del_rcu + hlist_add_after_rcu + hlist_add_before_rcu hlist_add_head_rcu + hlist_replace_rcu + list_splice_init_rcu() -RCU grace period: +RCU: Critical sections Grace period Barrier + + rcu_read_lock synchronize_net rcu_barrier + rcu_read_unlock synchronize_rcu + call_rcu + + +bh: Critical sections Grace period Barrier + + rcu_read_lock_bh call_rcu_bh rcu_barrier_bh + rcu_read_unlock_bh + + +sched: Critical sections Grace period Barrier + + [preempt_disable] synchronize_sched rcu_barrier_sched + [and friends] call_rcu_sched + + +SRCU: Critical sections Grace period Barrier + + srcu_read_lock synchronize_srcu N/A + srcu_read_unlock - synchronize_net - synchronize_sched - synchronize_rcu - synchronize_srcu - call_rcu - call_rcu_bh See the comment headers in the source code (or the docbook generated from them) for more information. |