What is RCU, Really? The following series on RCU from Linux Weekly News is a good place to start. What is RCU, Fundamentally? What is RCU's Usage? What is RCU's API? (Includes annotated list of references.) The following sections provide some additional viewpoints and information. RCU is a synchronization mechanism that was added to the Linux kernel during the 2.5 development effort that is optimi