On 05/26/2017 05:53 AM, Ming Lei wrote:

Hi,

The 1st patch moves sw queue's bio merge before plugging, then
the sequential I/O performance regression by blk-mq can be fixed.

The 2nd patch makes the sw queue's bio merge as the default .bio_merge
if no io scheduler is used or the io scheduler doesn't provide
.bio_merge.

This post splits the orginal one into two patches to make diff easy-read
as suggested by Christoph.

Looks good to me now, thanks Ming. I'll queue this up for 4.13 when
I open that up, which is very soon.

-- 
Jens Axboe