Re: [for-4.16 PATCH v5 2/3] blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback

2018-01-17 Thread Jens Axboe
On 1/16/18 9:33 PM, Mike Snitzer wrote: > From: Ming Lei > > blk_insert_cloned_request() is called in the fast path of a dm-rq driver > (e.g. blk-mq request-based DM mpath). blk_insert_cloned_request() uses > blk_mq_request_bypass_insert() to directly append the request to

[for-4.16 PATCH v5 2/3] blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback

2018-01-16 Thread Mike Snitzer
From: Ming Lei blk_insert_cloned_request() is called in the fast path of a dm-rq driver (e.g. blk-mq request-based DM mpath). blk_insert_cloned_request() uses blk_mq_request_bypass_insert() to directly append the request to the blk-mq hctx->dispatch_list of the underlying