I'd like to see these changes included during the 4.9 merge. The
blk-mq change is a straight-forward switch from work_struct to
delayed_work and the addition of the blk_mq_delay_kick_requeue_list()
interface.
Jens, please pick up the first patch and I'll rebase linux-dm.git
ontop of your 4.9 branch. Hannes, please re-review/ack as you like.
These changes offer reduced CPU utilization during DM multipath's all
path down case (when 'queue_if_no_path' is enabled). Please see each
patch's header for more details.
v2: fixed 'msecs' variable name to be 'delay' in blk-mq, use
msecs_to_jiffies() in dm-rq call to blk-mq, also made
DM-mpath kick the queue if/when a path is reinstated
Mike Snitzer (6):
blk-mq: introduce blk_mq_delay_kick_requeue_list()
dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests
dm rq: reduce arguments passed to map_request() and
dm_requeue_original_request()
dm rq: introduce dm_mq_kick_requeue_list()
dm mpath: use dm_mq_kick_requeue_list()
dm mpath: delay the requeue of blk-mq requests while all paths down
block/blk-mq.c | 15 ++++++++---
drivers/md/dm-mpath.c | 29 ++++++++++++---------
drivers/md/dm-rq.c | 59 ++++++++++++++++++++++++++-----------------
drivers/md/dm-rq.h | 2 ++
include/linux/blk-mq.h | 1 +
include/linux/blkdev.h | 2 +-
include/linux/device-mapper.h | 1 +
7 files changed, 69 insertions(+), 40 deletions(-)
--
2.7.4 (Apple Git-66)
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