Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 2/2] rcu: Allow TREE_PREEMPT_RCU on UP systems | Date | Sat, 26 Jan 2013 16:23:47 -0800 |
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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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> --- init/Kconfig | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig index a5e90e1..fb19b46 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 -- 1.7.8
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