Messages in this thread | | | Subject | RCU Kconfig help text | From | Valdis.Kletnieks@vt ... | Date | Sat, 05 Sep 2009 09:27:10 -0400 |
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init/Kconfig says:
"choice prompt "RCU Implementation" default TREE_RCU
config TREE_RCU bool "Tree-based hierarchical RCU" help This option selects the RCU implementation that is designed for very large SMP system with hundreds or thousands of CPUs. It also scales down nicely to smaller systems.
config TREE_PREEMPT_RCU bool "Preemptable tree-based hierarchical RCU" depends on PREEMPT help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response is also required.
endchoice"
This leaves somebody who has a laptop wondering which choice is best for a system with only one or two cores that has CONFIG_PREEMPT defined. One choice says it scales down nicely, the other explicitly has a 'depends on PREEMPT' attached to it...
(Yes, I realize in practice, the RCU sections on a laptop are probably usually so short they don't matter in practice. I finally concluded TREE_PREEMPT was apparently a rename of CONFIG_PREEMPT_RCU and went with that since that was working for me before...)
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