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.
V2:
- remove a 'goto' in patch 1, as suggested by Christoph
Thanks,
Ming
Ming Lei (2):
blk-mq: merge bio into sw queue before plugging
blk-mq: make per-sw-queue bio merge as default .bio_merge
block/blk-mq-sched.c | 62 ++++++++++++++++++++++++++++++++++++----
block/blk-mq-sched.h | 4 +--
block/blk-mq.c | 80 +++++++---------------------------------------------
3 files changed, 68 insertions(+), 78 deletions(-)
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2.9.4
