История изменений

One of the parts of io_uring that I find the most interesting is the possibility to have the kernel poll for new SQEs instead of the user having to inform the kernel via io_uring_enter() (wrapped by io_uring_submit() in liburing). By using io_uring_queue_init_params to pass in flags to io_uring initialisation and setting the IORING_SETUP_SQPOLL flag, the kernel will keep polling for up to params.sq_thread_idle milliseconds after the last SQE was submitted. Any SQEs you put into the SQE ring will automatically be picked up without any system calls required. After sq_thread_idle milliseconds have passed, the polling kernel thread will stop and you will need to call io_uring_enter() again to start it back up. When using liburing, io_uring_submit() will automagically keep track of whether the kernel thread is still alive and skip the syscall if it is not required.

Вот статья короче: https://wjwh.eu/posts/2021-10-01-no-syscall-server-iouring.html

Это POC, но в итоге мы придем к этому в виде production ready решения.

One of the parts of io_uring that I find the most interesting is the possibility to have the kernel poll for new SQEs instead of the user having to inform the kernel via io_uring_enter() (wrapped by io_uring_submit() in liburing). By using io_uring_queue_init_params to pass in flags to io_uring initialisation and setting the IORING_SETUP_SQPOLL flag, the kernel will keep polling for up to params.sq_thread_idle milliseconds after the last SQE was submitted. Any SQEs you put into the SQE ring will automatically be picked up without any system calls required. After sq_thread_idle milliseconds have passed, the polling kernel thread will stop and you will need to call io_uring_enter() again to start it back up. When using liburing, io_uring_submit() will automagically keep track of whether the kernel thread is still alive and skip the syscall if it is not required.

Вот статья короче: https://wjwh.eu/posts/2021-10-01-no-syscall-server-iouring.html

One of the parts of io_uring that I find the most interesting is the possibility to have the kernel poll for new SQEs instead of the user having to inform the kernel via io_uring_enter() (wrapped by io_uring_submit() in liburing). By using io_uring_queue_init_params to pass in flags to io_uring initialisation and setting the IORING_SETUP_SQPOLL flag, the kernel will keep polling for up to params.sq_thread_idle milliseconds after the last SQE was submitted. Any SQEs you put into the SQE ring will automatically be picked up without any system calls required. After sq_thread_idle milliseconds have passed, the polling kernel thread will stop and you will need to call io_uring_enter() again to start it back up. When using liburing, io_uring_submit() will automagically keep track of whether the kernel thread is still alive and skip the syscall if it is not required.