Книга: Embedded Linux Primer: A Practical, Real-World Approach Preempt RCU Preempt RCU

RCU (Read-Copy-Update)[120] is a special form of synchronization primitive in the Linux kernel designed for data that is read frequently but updated infrequently. You can think of RCU as an optimized reader lock. The real-time patch adds CONFIG_PREEMPT_RCU, which improves latency by making certain RCU sections preemptable.

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