diff options
Diffstat (limited to 'Documentation/RCU/whatisRCU.txt')
-rw-r--r-- | Documentation/RCU/whatisRCU.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/RCU/whatisRCU.txt b/Documentation/RCU/whatisRCU.txt index 69ee188515e7..bf0f6de2aa00 100644 --- a/Documentation/RCU/whatisRCU.txt +++ b/Documentation/RCU/whatisRCU.txt | |||
@@ -873,7 +873,7 @@ d. Do you need to treat NMI handlers, hardirq handlers, | |||
873 | and code segments with preemption disabled (whether | 873 | and code segments with preemption disabled (whether |
874 | via preempt_disable(), local_irq_save(), local_bh_disable(), | 874 | via preempt_disable(), local_irq_save(), local_bh_disable(), |
875 | or some other mechanism) as if they were explicit RCU readers? | 875 | or some other mechanism) as if they were explicit RCU readers? |
876 | If so, you need RCU-sched. | 876 | If so, RCU-sched is the only choice that will work for you. |
877 | 877 | ||
878 | e. Do you need RCU grace periods to complete even in the face | 878 | e. Do you need RCU grace periods to complete even in the face |
879 | of softirq monopolization of one or more of the CPUs? For | 879 | of softirq monopolization of one or more of the CPUs? For |
@@ -884,7 +884,12 @@ f. Is your workload too update-intensive for normal use of | |||
884 | RCU, but inappropriate for other synchronization mechanisms? | 884 | RCU, but inappropriate for other synchronization mechanisms? |
885 | If so, consider SLAB_DESTROY_BY_RCU. But please be careful! | 885 | If so, consider SLAB_DESTROY_BY_RCU. But please be careful! |
886 | 886 | ||
887 | g. Otherwise, use RCU. | 887 | g. Do you need read-side critical sections that are respected |
888 | even though they are in the middle of the idle loop, during | ||
889 | user-mode execution, or on an offlined CPU? If so, SRCU is the | ||
890 | only choice that will work for you. | ||
891 | |||
892 | h. Otherwise, use RCU. | ||
888 | 893 | ||
889 | Of course, this all assumes that you have determined that RCU is in fact | 894 | Of course, this all assumes that you have determined that RCU is in fact |
890 | the right tool for your job. | 895 | the right tool for your job. |