On Mon, Jan 15 2018 at 11:58am -0500,
Ming Lei wrote:
> blk_insert_cloned_request() is called in fast path of dm-rq driver, and
> in this function we append request to hctx->dispatch_list of the underlying
> queue directly.
>
> 1) This way isn't efficient enough because hctx lock is always requi
blk_insert_cloned_request() is called in fast path of dm-rq driver, and
in this function we append request to hctx->dispatch_list of the underlying
queue directly.
1) This way isn't efficient enough because hctx lock is always required
2) With blk_insert_cloned_request(), we bypass underlying que
