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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-01-08 15:48:33 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-01-28 22:06:22 -0800 |
| commit | 9fc52d832b5e7f6e175f3b20ae94504b780b9fd3 (patch) | |
| tree | ce618667492e0d87b496dad1f605674bbb6a5bc4 /init | |
| parent | 6bfc09e2327dfbffc312004c16188dbf8dfb0297 (diff) | |
| download | lwn-9fc52d832b5e7f6e175f3b20ae94504b780b9fd3.tar.gz lwn-9fc52d832b5e7f6e175f3b20ae94504b780b9fd3.zip | |
rcu: Allow TREE_PREEMPT_RCU on UP systems
The TINY_PREEMPT_RCU is complex, does not provide that much memory
savings, and therefore TREE_PREEMPT_RCU should be used instead. The
systems where the difference between TINY_PREEMPT_RCU and TREE_PREEMPT_RCU
are quite small compared to the memory footprint of CONFIG_PREEMPT.
This commit therefore takes a first step towards eliminating
TINY_PREEMPT_RCU by allowing TREE_PREEMPT_RCU to be configured on !SMP
systems.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index a5e90e139ba5..fb19b46c0042 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -453,7 +453,7 @@ config TREE_RCU config TREE_PREEMPT_RCU bool "Preemptible tree-based hierarchical RCU" - depends on PREEMPT && SMP + depends on PREEMPT help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or @@ -461,6 +461,8 @@ config TREE_PREEMPT_RCU is also required. It also scales down nicely to smaller systems. + Select this option if you are unsure. + config TINY_RCU bool "UP-only small-memory-footprint RCU" depends on !PREEMPT && !SMP |