ALT The io_uring subsystem in the Linux kernel provides an in- terface for asynchronous I/O. Its name has its roots in the ring buffers shared between user space and kernel space that alleviate the overheads of copying buffers between them [3]. It allows the application to submit an I/O request and concurrently perform other tasks until it receives a notification from the OS on the com- pletion of the I/O operation. With io_uring, the application first calls the io_uring_setup() system call to set up two memory regions: the submission and completion queues. The applications then submit I/O requests to the submission queue and call the io_uring_enter() system call to tell the OS to start processing the I/O requests. However, unlike the blocking read() and write() calls, io_uring_enter() does not block the thread by returning control to the userspace. The application can now perform other work concurrently and periodically poll the completion queue in userspace for I/O completion.