diff options
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/rcu.txt | 10 | ||||
| -rw-r--r-- | Documentation/RCU/whatisRCU.txt | 8 |
2 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/RCU/rcu.txt b/Documentation/RCU/rcu.txt index 7aa2002ade77..2a23523ce471 100644 --- a/Documentation/RCU/rcu.txt +++ b/Documentation/RCU/rcu.txt | |||
| @@ -36,7 +36,7 @@ o How can the updater tell when a grace period has completed | |||
| 36 | executed in user mode, or executed in the idle loop, we can | 36 | executed in user mode, or executed in the idle loop, we can |
| 37 | safely free up that item. | 37 | safely free up that item. |
| 38 | 38 | ||
| 39 | Preemptible variants of RCU (CONFIG_PREEMPT_RCU) get the | 39 | Preemptible variants of RCU (CONFIG_TREE_PREEMPT_RCU) get the |
| 40 | same effect, but require that the readers manipulate CPU-local | 40 | same effect, but require that the readers manipulate CPU-local |
| 41 | counters. These counters allow limited types of blocking | 41 | counters. These counters allow limited types of blocking |
| 42 | within RCU read-side critical sections. SRCU also uses | 42 | within RCU read-side critical sections. SRCU also uses |
| @@ -79,10 +79,10 @@ o I hear that RCU is patented? What is with that? | |||
| 79 | o I hear that RCU needs work in order to support realtime kernels? | 79 | o I hear that RCU needs work in order to support realtime kernels? |
| 80 | 80 | ||
| 81 | This work is largely completed. Realtime-friendly RCU can be | 81 | This work is largely completed. Realtime-friendly RCU can be |
| 82 | enabled via the CONFIG_PREEMPT_RCU kernel configuration parameter. | 82 | enabled via the CONFIG_TREE_PREEMPT_RCU kernel configuration |
| 83 | However, work is in progress for enabling priority boosting of | 83 | parameter. However, work is in progress for enabling priority |
| 84 | preempted RCU read-side critical sections. This is needed if you | 84 | boosting of preempted RCU read-side critical sections. This is |
| 85 | have CPU-bound realtime threads. | 85 | needed if you have CPU-bound realtime threads. |
| 86 | 86 | ||
| 87 | o Where can I find more information on RCU? | 87 | o Where can I find more information on RCU? |
| 88 | 88 | ||
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt index 97ded2432c59..e41a7fecf0d3 100644 --- a/Documentation/RCU/whatisRCU.txt +++ b/Documentation/RCU/whatisRCU.txt | |||
| @@ -136,10 +136,10 @@ rcu_read_lock() | |||
| 136 | Used by a reader to inform the reclaimer that the reader is | 136 | Used by a reader to inform the reclaimer that the reader is |
| 137 | entering an RCU read-side critical section. It is illegal | 137 | entering an RCU read-side critical section. It is illegal |
| 138 | to block while in an RCU read-side critical section, though | 138 | to block while in an RCU read-side critical section, though |
| 139 | kernels built with CONFIG_PREEMPT_RCU can preempt RCU read-side | 139 | kernels built with CONFIG_TREE_PREEMPT_RCU can preempt RCU |
| 140 | critical sections. Any RCU-protected data structure accessed | 140 | read-side critical sections. Any RCU-protected data structure |
| 141 | during an RCU read-side critical section is guaranteed to remain | 141 | accessed during an RCU read-side critical section is guaranteed to |
| 142 | unreclaimed for the full duration of that critical section. | 142 | remain unreclaimed for the full duration of that critical section. |
| 143 | Reference counts may be used in conjunction with RCU to maintain | 143 | Reference counts may be used in conjunction with RCU to maintain |
| 144 | longer-term references to data structures. | 144 | longer-term references to data structures. |
| 145 | 145 | ||