Uh-oh, It's I/O Ordering!

Explore the intricacies of I/O ordering in the Linux kernel through this informative conference talk. Delve into the complexities of memory barriers used to enforce ordering of memory accesses between multiple agents, focusing on scenarios involving I/O and DMA-capable devices. Gain insights into the appropriate use of I/O ordering barriers in driver development, optimal timing for their implementation, and strategies for achieving peak performance. Learn from Will Deacon, a Linux kernel expert from Arm Ltd., as he provides a comprehensive overview of mainline Linux I/O ordering barrier support, covering topics such as store buffering, sequential consistency, litmus tests, memory models, and DMA barriers. Discover practical examples and API semantics to enhance your understanding of this critical aspect of kernel development.