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发表于 2010-4-6 23:04:12
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RCU subsystem--->
This setting allows lock-free read-only access to data structures that are concurrently modified on SMP systems. It is turned on because it allows for better throughput. The default setting is for a fully preemptable RCU. Since it is only geared towards SMP systems, technically, monoprocessor systems can get away without it. The list of available RCU options is dictated on whether or not you've chosen to use kernel preemption. If not, the list is small. If kernel preemption is on, it is recommended you use the
(*) Preemptible RCU setting. |
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