Hi, Unless we're using SQPOLL, any task_work queue will result in an IPI to the target task unless it's running in the kernel already. This isn't always needed, particularly not for the common case of not sharing the ring. In certain workloads, this can provide a 5-10% improvement. Some of this is due the cost of the IPI, and some from needlessly interrupting the target task when the work could just get run when completions are being waited for. Patches 1..4 are prep patches, patch 5 is the actual change. -- Jens Axboe
