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Use task_work_add if it is available, since task_work_add can bring up better performance, especially batching signaling ->ubq_daemon can be done. It is observed that task_work_add() can boost iops by +4% on random 4k io test. Also except for completing io command, all other code paths are same with completing io command via io_uring_cmd_complete_in_task. Meantime add one flag of UBLK_F_URING_CMD_COMP_IN_TASK for comparing the mode easily. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20220713140711.97356-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>