深入解析 Linux 内核内存屏障机制:从 CPU 缓存一致性协议(MESI)与 Store Buffer 导致的乱序问题开始,完整分析 Linux 内核的内存屏障API(barrier/mb/rmb/wmb/READ_ONCE/WRITE_ONCE)、Acquire/Release 语义,并通过生产者-消费者环形缓冲区、RCU宽限期、per-cpu变量发布三个经典模式详解屏障用法。涵盖 RISC-V 弱序架构、DMA 同步、KCSAN 数据竞争检测及 C11 Memory Model 的未来发展。
A deep dive into Linux eBPF XDP technology, covering XDP architecture, program lifecycle, Maps mechanism, packet modification, redirection, XDP_DROP/XDP_PASS/XDP_TX/XDP_REDIRECT actions, and production use cases including DDoS protection, Layer-4 load balancing, and AF_XDP.