Applications can use this flag to avoid accept thundering herd. Signed-off-by: Jiufei Xue <jiufei.xue@xxxxxxxxxxxxxxxxx> --- fs/io_uring.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index f668982..b8102b2 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4109,7 +4109,10 @@ static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, pt->error = 0; poll->head = head; - add_wait_queue(head, &poll->wait); + if (poll->events & EPOLLEXCLUSIVE) + add_wait_queue_exclusive(head, &poll->wait); + else + add_wait_queue(head, &poll->wait); } static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, @@ -4530,7 +4533,7 @@ static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe return -EBADF; events = READ_ONCE(sqe->poll_events); - poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP; + poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | EPOLLEXCLUSIVE; get_task_struct(current); req->task = current; -- 1.8.3.1
