Hi ming

On 05/30/2018 05:13 PM, Ming Lei wrote:

quoted

Yes, it maybe good for merging of 'none', because the rq_list is split into 3
lists, and not need to iterate the whole rq_list any more.
But what's about the dispatch when there is no io scheduler.

blk_mq_flush_busy_ctxs() and blk_mq_dequeue_from_ctx() should work
fine in case of 'none' if per-domain list is added to ctx. Then we can make
none to be a bit fair on READ/WRITE.

But how to determine when to dispatch READ, WRITE or other more, when there is no io scheduler ?

Thanks
Jianchao